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A body strikes the floor vertically with a velocity $u$ and rebounds at the same speed. The change in velocity would be

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a

u

b

3 u

c

2 u

d

zero

answer is D.

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Detailed Solution

A body strikes the floor vertically with a velocity

u

and rebounds at the same speed. The change in velocity would be zero.
As the body strikes the floor vertically with a velocity u and rebounds at the same speed i.e. with the same velocity u, there is no change in velocity of the body as the velocity at the time of striking the floor and velocity after rebound is same. But after rebounding the direction of velocity of the body is opposite to its initial velocity. There were no changes in the magnitude velocity of the ball.

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