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JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE
1
Medium
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Analyzing
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Two balls are dropped from the top of a cliff at a time interval . The first ball hits the ground, rebounds elastically (essentially reversing direction instantly without losing speed) and collides with the second ball at height above the ground. How high is the top of the cliff (in )?
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Correct option: A
180 m
Option A (180 m) is correct because by considering the elastic collision and the time interval between the balls, the height of the cliff can be calculated.
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Reason: Free fall means the vertical acceleration of the body is equal to . A ball is thrown vertically upward with speed 15 m/s and it returns to the ground with speed 10 m/s as a constant air resistance acts. The maximum height attained by the ball is Which of the following is not a derived quantites? Assertion: If a body is dropped from the top of a tower of height and another body is thrown up simultaneously with velocity from the foot of the tower, then both of them would meet after a time .
Reason: For a body projected upwards, the distance covered by the body in the last second of its upward journey is always irrespective of velocity of projection. A particle is having uniform acceleration. If its displacement from to second is and change in velocity is . Find its displacement (in ) in second. An aeroplane flies 400m north and 300m south and then flies 1200m upwards, then net displacement is