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A boy is standing on an open lift moving upwards with speed 10 m s-1. The boy throws the ball with speed w.r.t. lift is 24.5 m s-1. In how much time the ball returns to the hand of boy? g=10 m s-2

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Important Questions on Kinematics

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A ball is dropped from a height of 19.6 m. The distance covered by it in the last second is
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Directions: Each of the following sentences in this section has a blank space and four words or group of words given after the sentence. Select the word or group of words you consider most appropriate for the blank space and indicate your response on the Answer Sheet accordingly.

Every rash driver becomes a ____ killer.

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A body moving with uniform acceleration 6 m/s2 starts from rest. The distance covered by it in 4th  second will be
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The velocity of a particle is v=v0+gt+Ft2 m s-1. Its position is x=0 at t=0 ; then its displacement after time (t=1 s) is :
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A particle starts from origin O from rest and moves with a uniform acceleration along the positive  x-axis . Identify all figures that correctly represent the motion qualitatively.
( a= acceleration, v= velocity, x=  dispalcement, t= time)
A Question Image
B Question Image
(C) Question Image
(D) Question Image

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A stone is dropped from the top of a building. When it crosses a point 5 m below the top, another stone starts to fall from a point 25 m below the top. Both stones reach the bottom of building simultaneously. The height of the building is :
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A box filled with water has a small hole on its side near the bottom. It is dropped from the top of a tower. As it falls, a camera attached on the side of the box records the shape of the water stream coming out of the hole. The resulting video will show
 
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For a body moving along a straight line, the following v-t graph is obtained.

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According to the graph, the displacement during

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Two sentences are given below and you are required to find the correct sentence which combines both the sentences.

Which is the correct combination of the given two sentences?

He is too tired. He could not stand.

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A person sitting in the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? g=10 m s-2
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In the following sentence, a blank space with four options is given. Select whichever preposition or determiner you consider the most appropriate for the blank space.

These are the good rules to live _____.

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In a car race on straight road, car A takes a time t less than car B at the finish and passes finishing point with a speed v more than that of car B. Both the cars start from rest and travel with constant acceleration a1 and a2  respectively. Then v is equal to:
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Water-drops are falling at regular intervals from a water tap situated at a height of 5 meters from the ground. Just at the moment, the first drop touches the ground, the third drop comes out. At that moment, the height of the second drop of water from the ground will be
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When a ball is thrown up vertically with a velocity v0 it reaches a height h. If one wishes to triple the maximum height, then the ball should be thrown with a velocity of
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A particle is thrown vertically up with a velocity of 100 m s-1. What will be the time taken by the body to reach the ground? Assume g=10 m s-2
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A stone is just released from the window of a train moving along a horizontal straight track. The stone will hit the ground following a ________
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A particle starts from origin at t=0 with a velocity of 15 i^ m·s-1 and moved in xy-plane with an acceleration of 15i^+20j^ m·s-2. The y-coordinate of the particle when it has 180 m as its x-coordinate is
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A body is projected vertically upwards with a velocity 'u' from the top of a tower. Time taken by it to reach the ground is 'n' times the time taken by it to reach the highest point in its path. Height of the tower is
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A body is thrown vertically upwards. Which one of the following graphs correctly represents the velocityv vs time t?
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An automobile, traveling at 40 km h-1, can be stopped at a distance of 40 m by applying brakes. If the same automobile is traveling at 80 km h-1, the minimum stopping distance in metres is (Assume no skidding):