Relative velocity of the river with respect to shore, V = 20 km/h.
Relative velocity of the river with respect to shore ,V = 10 km/h
Velocity of the shore = 0 km/h
Relative velocity of the river with respect to shore:
[tex]V = V_{r} - V_{s}[/tex]
Velocity of the river [tex]V_{r}[/tex] = 10 km/h
Relative velocity of the boat with respect to river ,V'= 10 km/h
[tex]V^{'} = V_b} -V_{r}[/tex]
Velocity of the boat [tex]V_b}[/tex] = 20 km/h
Relative velocity of the boat with respect to shore, V":
[tex]V_{"} = V_{b} - V_{s}[/tex]
Relative velocity of the boat with respect to shore is 20 km/h.
What is Relative velocity?It is the pace at which one object's relative location changes in relation to another object over time.
Think about two trains that are traveling in the same direction and at the same pace. Even though the tracks, buildings, and trees on each side of the railway indicate that both trains are moving, to the observer of one train, the other train appears to be stationary. The other train seems to be moving at a constant speed.
The speed at which one thing moves in relation to another is known as the relative velocity of the two objects.
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What advantages does a large diameter astronomical telescope have over a telescope of a smaller diameter?.
Larger diameter, capabilities of the better gathering of light, and better resolving power are those advantages that a large diameter astronomical telescope has over a telescope of a smaller diameter.
The larger the lens or mirror which is having the diameter or aperture, the telescope will then gather more light and will be at higher resolution as the viewer has the chance to see fine in detail it can. Larger scopes also have focal lengths of longer size, which means the magnifications will be greater and the sizes of images are possible with accessibility by both the eye as well as the camera.
A larger telescope mirror is a type that allows us to view the fainter objects farther into the region of space, therefore the larger one in round nature is better. The shape does not matter just as long as it can bring light to the focus point.
Large telescopes will be having several merits over their smaller counterparts, and the concerned resolution will be as how much in detail we are able to see a celestial object is the first priority. Generally, the resolution depends mainly on two things the stability of the atmosphere as well as the aperture present in your telescope. The user can only control any one of these factors.
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A bullet is fired horizontally 0.58 meters off the ground. Assuming gravity is 9.8 m/s2, how long (t) was the bullet in the air?
Since the gravity acts on the vertical component of the velocity of the object, the bullet will spend 0.34 s in air.
What is Vertical Motion ?
Vertical motion is also known as motion under gravity. The gravity acts on the vertical component of the velocity of the object.
Given that a bullet is fired horizontally 0.58 meters off the ground. Assuming gravity is 9.8 m/s², the gravity will act on the bullet vertically.
The height h = 0.58 mThe initial velocity u = 0Using the formula h = ut + 1/2gt² we can know how long (t) was the bullet in the air.
Substitute all the parameters into the formula
0.58 = 0 + 1/2 × 9.8 × t²
0.58 = 4.9t²
t² = 0.58/4.9
t² = 0.1184
t = √0.1184
t = 0.34 s
Therefore, the bullet will spend 0.34 s in air.
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The force between two masses m and m is 8.0 n when they are a certain distance r apart. what will the force between these two masses be if the distance between them is increased by a factor of four?
The force between two masses when the distance between those two masses is increased by a factor of four is 0.5 N
We know that,
F = G [tex]m_{1}[/tex] [tex]m_{2}[/tex] / [tex]r^{2}[/tex]
where,
F = Force
G = Constant
[tex]m_{1}[/tex], [tex]m_{2}[/tex] = Masses
r = Distance between those two forces
Given that,
F = 8 N
When the distance between those two masses is increased by a factor of four,
[tex]F^{'}[/tex] = G [tex]m_{1}[/tex] [tex]m_{2}[/tex] / [tex]( 4r)^{2}[/tex]
[tex]F^{'}[/tex] = F / 16
[tex]F^{'}[/tex] = 8 / 16 = 1 / 2
[tex]F^{'}[/tex] = 0.5 N
Force is a phenomenon which can cause an objects motion to change. It causes an object with mass to change its velocity.
Therefore, the force between two masses when the distance between those two masses is increased by a factor of four is 0.5 N
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J. J. Thomson used a cathode-ray tube to calculate the charge-to-mass ratio of the electron. Which of these suggested the presence of a negative particle?.
J. J. Thomson used a cathode-ray tube to calculate the charge-to-mass ratio of the electron. The deflection of cathode rays towards the positively charged surface and emission of green light at the far end of the tube confirmed that they are negatively charged particles.
In 1897, J.J Thomson performed a cathode ray tube experiment to determine the charge-to-mass ratio of electrons.
Due to high voltage, a beam of particles was allowed to flow from the negatively charged end to the positively charged end of the tube.
One end of the tube was painted with phosphorous. When electrons struck the wall a green spark was observed which confirmed the presence of negatively charged particles i.e. electrons.
To put it simply, cathode rays came from the cathode tube and deflected towards a positively charged plate showing that they are negatively charged particles.
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The gusset plate is subjected to the forces of three members. determine the tension force in member c and its angle, , for equilibrium. the forces are concurrent at point o. take f = 8 kn.
The tension force would be 7.62N. Its angle of equilibrium would be 70.23°
CalculationFor equilibrium,
for direction X,
Tcos([tex]\theta[/tex]-36.87°) = 8cos (36.87°) → 1
For direction Y,
9 = 8sin36.87° + Tsin([tex]\theta\\[/tex]-36.87°)
Tsin([tex]\theta\\[/tex]-36.87°) = 9- 8sin(36.87°) → 2
Now dividing equation 2 by 1,
tan([tex]\theta\\[/tex]-36.87°) = [tex]\frac{9-8*3/5}{8*4/5}[/tex]
tan([tex]\theta\\[/tex]-36.87°) = 0.66
[tex]\theta\\[/tex] - 36.87°= [tex]tan^{-1}[/tex](0.66)
[tex]\theta\\[/tex] - 36.87° = 33.42°
⇒ [tex]\theta[/tex] = 40.29°
Now from equation 1,
Tcos(33.42°) = 8cos(36.87°)
T = [tex]\frac{8*4/5}{0.84}[/tex]
T = 7.62N
Thus, we get the tension force as 7.62N
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You measure the mass of a 0.500 kg (500 g) standard on your balance four times. The following measurements result: 492 g, 507 g,
505 g, 496 g.
Which choice best describes your balance?
not precise and not accurate
not precise but accurate
precise but not accurate
precise and accurate
If the measurement is taken for four different times for same weight and is always different then the balance is precise but not accurate.
What are ways to measure mass?There are numerous instruments available for measuring mass in various settings. The use of gravitational interaction between objects is one of them, along with balances and scales, measurement transducers, vibrating tube sensors, Newtonian mass measurement devices, and balances and scales.
The kilogram, which is defined as equal to 6.6260 x 10³⁴joule second in terms of Planck's constant, is the unit of mass in the International System of Units (SI). A joule is equal to one kilogram multiplied by one square meter per second.
A beam balance is always used to determine mass. Because a spring balance measures weight rather than mass, it will read differently depending on where you are on the planet.
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What is the object’s position at t=2 s? And does the car change direction? If so at what speed?
The direction of the car will not change and the speed of the car at time of 2 seconds will be 4 m/s.
What is speed?
The size of the change in an object's position over time or the size of the change in that object's position per unit of time makes the speed of an object, also known as v in kinematics, a scalar number. The instantaneous speed is the upper limit of the average speed as the duration of the time interval gets closer to zero.
According to the question,
Initial Speed, u is 12 m/s,
Time, t at 2 seconds and,
acceleration is -4 m/s².
Now by using Equation of motion :
v=u+at
v=12+(- 4 m/s²)(2 sec)
V=12-8
V= 4 m/s.
Hence, the speed of the car will be 4 m/s at time 2 seconds and the direction of the car will not change.
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6. a stuntman is launched vertically into the air from a cannon and eventually falls back to the ground, landing in the cannon exactly where he started. he reached a maximum height of 22 meters in 3.4 seconds and fell back to the ground in 7.6 seconds. the average velocity of the stuntman is 0 m/s, and the average speed of the stuntman is.
Answer:
w
Explanation:
Sokol
Two gases are contained in gas bulbs connected by a valve. Gas a is present in a 1 liter bulb at a pressure of 818 torr. Gas b exerts a pressure of 328 torr in a 1 liter bulb. The valve is opened and the two gases come to equilibrium. What is the partial pressure of gas a expressed after equilibrium?.
The partial pressure of gas expressed after equilibrium is 409 torr.
Which gas is used for bulbs?Incandescent light bulbs are usually filled with argon, which is a common gas. It prolongs bulb life by keeping the tungsten filaments from decaying too quickly. Lighting also makes use of other gases like helium, neon, nitrogen, and krypton.Incandescent lights are what gas lamps are. They generate heat by burning fuel like propane, white gas, or kerosene, and the heat drives light production from the mantles. The mantles, which are made of a ceramic mesh, contain the lantern's flame.The first kind of gas employed, argon, is a gas that is typically found in incandescent light bulbs. Nitrogen may occasionally be added to argon gas. Halogen or xenon gas can be found in some light bulbs. Some light bulbs also include krypton gas.What is the partial pressure of gas expressed after equilibrium:
1. Write out the units given.
V1= 1 L
Ptot= 818 torr
PPB= 328 torr
V2= 1L
2. Remember= PaVa= PtotVtot
3. Add together volumes for total volumes.
1 L + 1 L= 2 liters
4. Plug in values and solve for PP of gas A.
PPA= Ptot x VA/Vtot
818 torr x 1/2 L= 409 torr
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Resolve a vector of 50 km at 35° south of West into its x and y components
Answer:
See below
Explanation:
With N at 0 degrees
35 degrees south of west becomes 90 + 35 = 125 °
x component 50 km cos 125 = - 28.7 km
y component 50 km sin 125 = 41 km
A balance has 30N on the left-hand side and 50N on the
right hand side. What weight must be added so that.
the sides are balanced, and to which side?
the equation is the position of a particle in space at time t. find the particle's velocity and acceleration vectors. then write the particle's velocity at as a product of its speed and direction.
The particle's velocity at as a product of its speed and direction is equal to 10 . [tex](\frac{8}{10},0,\frac{6}{10} )[/tex]
What is velocity?Velocity is the directional speed of a moving item as an indication of its rate of change in position as seen from a specific frame of reference and measured by a specific time standard (e.g., 60 km/h northbound). The idea of velocity is crucial in kinematics, the part of classical mechanics that explains the motion of bodies.
A physical vector quantity called velocity requires both magnitude and direction to be defined. Speed is a coherent derived unit that expresses the scalar absolute value (magnitude) of velocity. Its quantity is expressed in SI units (metric system) of metres per second (m/s or ms1). For example, "5 meters per second" is a scalar while "5 meters per second east" is a vector.
The particle's velocity is the derivative of its position. The particle's acceleration is the derivative of its velocity. You can calculate the velocity and acceleration as follows:
[tex]\vec{v}(t)=\frac{d r}{d t}=\frac{d}{d t}(8 t+5) \vec{i}+\frac{d}{d t}\left(8 t^2-2\right) \vec{j}+\frac{d}{d t}(6 t) \vec{k}=8 \vec{\imath}+16 t \vec{j}+6 \vec{k}[/tex]
[tex]\vec{a}(t)=\frac{d v}{d t}=\frac{d}{d t}(8) \vec{i}+\frac{d}{d t}(16 t) \vec{j}+\frac{d}{d t}(6) \vec{k}=0 \vec{i}+16 \vec{j}+0 k[/tex]
The velocity at t = 0 is [tex]\vec{v}(0)=8 \vec{i}+0 \vec{j}+6 k[/tex]
if the speed at t = 0 is [tex]||\vec{v}(0)||[/tex] = 10 then the velocity at t = 0 can be written as a product of the speed at t = 0 & the direction at t = 0 is
[tex]\vec{v}(0)=\|\vec{v}(0)\| \frac{\vec{v}(0)}{\|\vec{v}(0)\|}=10 \cdot\left(\frac{8}{10}, 0, \frac{6}{10}\right)[/tex]
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Full question
The equation r (t) = (8t + 5)i + (8t^2 - 2)j + (6t )k is the position of a particle in space at time t. Find the particle's velocity and acceleration vectors. Then write the particle's velocity at t equals 0 as a product of its speed and direction. What is the velocity vector?
. You roll a tennis ball a distance of 18 meters. It takes 6 seconds to cover the distance. What is the average speed of the tennis ball?
I got 3 as an answer am I right
all I can offer is 14 points since that's all I have left lol
The average speed of the tennis ball is 3 m/s.
What is average speed?Average speed can be defined as the ratio of the total distance to the total time covered by the body. The S.I unit of average speed is m/s.
To calculate the formula below.
Formula:
S = d/t............... Equation 1Where:
S = Average speed of the balld = Total Distancet = Total time.From the question,
Given:
d = 18 meterst = 6 secondsSubstitute these values into equation 1
S = 18/6S = 3 m/sHence, The average speed of the tennis ball is 3 m/s.
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bathyscaphes are capable of submerging to great depths in the ocean. what is the pressure at a depth of 5 km, assuming that seawater has a constant specific gravity of sg
Water depth Bathyscaphes can submerge at a depth of h=5 km=5000 m.
the seawater's particular weight,
γ=10.1kN/m3
Through the equation, the density of the seawater and its specific weight are connected.
γ=ρg→(I)
where rho is the seawater's density and g is the acceleration brought on by gravity.
Given is the pressure at a depth of h meters. ,
P=ρgh→(II)
When equation I is substituted, equation (ii),
P=γh
About substituting
P=10.1×103×5000=50.5×106Pa=50.5MPa
1 Pascal =1.45×10−4psI
50.5 MPa corresponds to
50.5MPa=50.5×106×1.45×10−4psI=7322.5psI
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Use Ohm's Law to calculate the following:
a) The voltage required to produce a current of 2A in a 12ohms resistor.
b) The voltage required to produce a current of 0.1A in a 200ohms resistor.
c) The current produced when a voltage of 12V is applied to a 10ohms resistor.
d) The current produced when a voltage of 230V is applied to a 10ohms resistor.
Ohm's Law is a formula used to determine how voltage, current, and resistance in an electrical circuit relate to one another.
Use Ohm's Law to calculate the following:
a) The voltage required to produce a current of 2A in a 12ohms resistor.
To scientists, Einstein's Relativity equation (E = mc2) is as fundamental as Ohm's Law (E = IR).
E = I x R
The difference in electric potential between two points, which is defined as the work required per unit of charge to move a test charge between the two points, is known as voltage, electric potential difference, electric pressure, or electric tension.
The formula reads voltage = current x resistance, or V = A x, or volts = amps x ohms.
Therefore, Voltage required = 2 * 12 = 24 volts
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infrared radiation has wavelengths ranging from about 800 nm to 1 mm. what is the frequency of radiation of wavelength 960 nm? answer in units of s−1 .
The frequency of radiation of the given wavelength is 3.125×[tex]10^{14}[/tex] Hz.
What is wavelength ?
Given λ = 960nm
f=c/λ
f= 3×[tex]10^{8}[/tex]/960×[tex]10^{-9}[/tex]
f= 3.125×[tex]10^{14}[/tex]
A waveform signal's wavelength is defined as the separation between two identical points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. This length in wireless systems is typically expressed in meters (m), centimeters (cm), or millimeters (mm).
The wavelength is the separation between two wave crests, while troughs have the same wavelength. The number of vibrations that pass over a specific place in a second is known as the frequency and is expressed in cycles per second (Hz) (Hertz).
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Photons are shone on a piece of metal and one electron is ejected for each absorbed photon. What happens when the wavelength of light is decreased?.
When the wavelength of light is decreased the ejected electrons would have greater kinetic energy.
What is kinetic energy?A kind of energy that an item or particle possesses as a result of its mobility is known as kinetic energy.
When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and consequently obtains kinetic energy.
An object's kinetic energy is the energy it has as a result of motion.
Kinetic energy is the force that drives an object's motion.
Kinetic energy can be found in moving objects such as a bullet traveling at high speed or a person walking.
The energy brought on by the random, continuous bouncing of atoms or molecules is another illustration of kinetic energy.
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A lion is running at constant speed toward a gazelle that is standing still, as shown in the top figure above. After several seconds, the gazelle notices the lion and accelerates directly toward him, hoping to pass the lion and force him to reverse direction. As the gazelle accelerates toward and past the lion, the lion changes direction and accelerates in pursuit of the gazelle. The lion and the gazelle eventually each reach constant but different speeds. Which of the following sets of graphs shows a reasonable representation of the velocities of the lion and the gazelle as functions of time?
The graph shown in the first option shows a reasonable representation of the velocities of the lion and the gazelle as functions of time, therefore the correct answer is option A.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.
As given in the problem if a lion is running at constant speed toward a gazelle that is standing still, as shown in the top figure above.
Thus, the correct answer is option A.
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vector a has magnitude 4 m and is directed to the south. vector a has magnitude 3 m and is directed to the east. what are the magnitude and direction of s – e? a. 5 m, southeast b. 1 m, southwest c. 5 m, southwest d. 1 m, southeast
The correct option is (c) 5m southwest.
What are vectors?A quantity or phenomena with independent qualities for both size and direction is called a vector. The word can also refer to a quantity's mathematical or geometrical representation. Velocity, momentum, force, electromagnetic fields, and weight are a few examples of vectors in nature.
the vector S and E is,
S = -4m j
E = -3m i
the vector is
|S - E| = √(-4)² + (-3)²
|S - E| = 5m
Types of Vectors List
Zero Vector.Unit Vector.Position Vector.Co-initial Vector.Like and Unlike Vectors.Co-planar Vector.Collinear Vector.Equal Vector.to learn more about vectors go to -
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How long would it take a fly to cover a 60 meter space while traveling at a speed of 5.4 m/s?
It would take a fly 11.11 seconds to cover the given distance of 60 meters.
Velocity is a term that describes the speed and direction of a point's motion. The speed at which the point is moving along its path in time is known as the magnitude of the velocity.
Velocity is a vector quantity that cannot be fully described by a number because it has direction in addition to magnitude.
Changes in an object's position are referred to as displacement. Displacement is represented by a vector. This implies that it has both a direction and a magnitude.
Given in the question
Velocity = 5.4 m/s
Distance = 60 meters
Time = Distance/Velocity
Put in the values, we get
Time = 60/5.4 seconds
Time = 11.11 seconds
Therefore, it would take 11.11 seconds for a fly to cover a 60-meter space while traveling at a speed of 5.4 m/s.
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2. A small 30-kilogram canoe is floating downriver at a speed
of 2 m/s. What is the canoe's kinetic energy?
a. 32 J
c. 120 J
b. 60 J
d. 900 J
(5)_____ states that "the of an object is equal to the on an object divided by the mass of the object.
Newton's second law of motion states that "the acceleration of an object is equal to the force on an object divided by the mass of the object."
Newton's second law of motion is also called the law of acceleration as it tells us about the acceleration of a moving object under the influence of an unbalanced force or net force not equal to zero.
According to the law, the acceleration of an object is directly proportional to the force on the object and inversely proportional to the mass of the object.
Acceleration a ∝ Force F ....1
Acceleration a ∝ 1/Mass m ....2
From 1 and 2 Acceleration a = [tex]\frac{Force}{Mass}[/tex]
Therefore, Newton's second law of motion states that "the acceleration of an object is equal to the force on an object divided by the mass of the object."
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A runner is jogging in a straight line at a steady [tex]v_{r}[/tex]= 4.5 km/hr. When the runner is L= 8.1 km from the finish line, a bird begins flying straight from the runner to the finish line at [tex]v_{b}[/tex]= 13.5 km/hr (3 times as fast as the runner). When the bird reaches the finish line, it turns around and flies directly back to the runner.
What cumulative distance does the bird travel? Even though the bird is a dodo, assume that it occupies only one point in space (a “zero” length bird), travels in a straight line, and that it can turn without loss of speed. Answer in units of km.
After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line.
How far does the bird travel from the beginning (including the distance traveled to the first encounter)? Answer in units of km.
Answer: 1325t miles
Explanation: you have to divide all of them
An appliance is rated at 4500 volt-ampere, 240 volts, single-phase. what is the maximum size fuse permitted?
the maximum size of fuse permitted in a single phase is 18.75 ampere.
POWER = amount of energy transferred per unit time.
Power = voltage x current
power = 4500 volt-ampere
voltage = 240 volt
current = power/voltage
= 4500/240
= 18.74 ampere
the maximum size of fuse permitted in a single phase is 18.75 ampere.
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.
If you want to determine the amount of water in a swimming pool what are you calculating?
A. Area
B. Volume
C. Distance
Length times width gives the surface area of the pool. Multiplying that by the average depth gives the volume in cubic feet. Since there are 7.5 gallons in each cubic foot, multiply the cubic feet of the pool by 7.5 to arrive at the volume of the pool (expressed in gallons).
Answer:
the answer is volume
Explanation:
wei is standing in wavy water and notices the depth of the waves varies in a periodic way that can be modeled by a trigonometric function. he starts a stopwatch to time the waves.
The function of wavy water is D(t) = 33.5 +21.5cos(2π/3·(t -1.1))
What are wave functions?In quantum physics, a wave function is a mathematical representation of the quantum state of a standalone quantum system. The probabilities for potential outcomes of measurements performed on the system may be calculated from the wave function, which is a complex-valued probability amplitude.
The function can be ...
D(t) = A +Bcos(C(t-p))
where A is the average depth (55+12)/2 = 33.5 cm,
B is the peak deviation from average, 55 -33.5 = 21.5 cm,
C is the horizontal scale factor (2π/T) = (2π/3) for a period (T) of 3 seconds,
and p is the phase offset, given as 1.1 seconds.
the function -
D(t) = 33.5 +21.5cos(2π/3·(t -1.1))
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A boat takes 4.0h to travel 26 km down a river, then 5.0h to return. how fast is the river flowing
The speed of the river is 0.5 Km/hr
How do find the speed of the river?Let X be the speed of the boat.
Let Y be the speed of the river.
Downstream speed
X - Y = 4
Upstream speed
X + Y = 5
By solving, we get
2X = 9
X = 4.5 Km/hr
Y = 0.5Km/hr
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check if
v^{2} = u^{2}+2as is dimensionally correct
Using dimensional analysis; L²/T⁴ = 2 * L²/T⁴
Thus, v² = u² + 2as is dimensionally correct.
What is dimensional analysis?Dimensional analysis is the process whereby the various quantities of measurement are expressed in their basic unit or the fundamental units from which they are derived.
The fundamental units which are used in dimensional analysis is done is:
mass expressed as Mlength expressed as Ltime expressed as TTo check if v² = u² + 2as is dimensionally correct:
unit of v = m/s = L/T
unit of u = L/T
unit of a = L/T²
s = L
(L/T)² = (L/T)² + L * L/T²
L²/T⁴ = L²/T⁴ + L²/T⁴
L²/T⁴ = 2 * L²/T⁴
The expression, v² = u² + 2as is dimensionally correct.
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An airplane is delivering food to a small island. It flies 100 m above the ground at a speed of 170 m/s .
The distance traveled is mathematically given as
D = 766.7 m
What is the distance traveled?The airplane's horizontal velocity was measured to be 170 meters per second.
100 meters is the equivalent of the distance above the earth.
Generally, the equation for distance is mathematically given as
s = u_0t + (1/2) g t2
then, we get
(100 m) = (0.5) (9.8 m/s2) t2
[tex]t = \sqrt{(100 m*4.9 m/s2)}[/tex]
t = √20.4 s2
t = 4.51 sec
we know that,
D = vx t
D= (170 m/s) (4.51 s)
D = 766.7 m
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A juggler throws two balls in the air. She throws the first ball up with a velocity of 9. 8 m/s. She throws the second ball up with a velocity of 14. 7 m/s. How long after catching the first ball will she catch the second?.
Juggler will catch the second ball 1 second after catching the first ball as the first ball comes down 1 second earlier than the second.
Two balls are thrown into the air. The first ball goes up with a velocity of 9.8m/s and the second ball goes with a velocity of 14.7m/s. We have to find out the Time difference between the balls when both of them land in the hand. We have Newton's first equation : v = u + at => t = (v-u)/a
where, v = Final velocity, u = Initial velocity, a=g = Acceleration of gravity, and t = Time
For First ball, v1 = 9.8m/s, u1 = 0, g = 9.8 (acceleration for gravity), t1 = time and multiplying the equation by 2 for marking journey of balls for both going up and down
=> t1 = 2(v1-u1)/g => t1 = (9.8-0)/9.8
=> t1 = 2 seconds
For second ball, v2 = 14.7m/s, u2 = 0, g = 9.8 (acceleration for gravity),
t2 = time & multiplying the equation by 2 for marking journey of ball for both going up and down => t2 = 2(v2-u2)/g
=> t2 = (14.7-0)/9.8 => t2 = 3 seconds
Difference between the time taken by both balls t = t2-t1
=> t = 1 second
So the second ball lands after 1 second.
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