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Velocity(Speed with Direction)

A body strike...

Question

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

A

u

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B

3u

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C

2u

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D

zero

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Solution

The correct option is D zero
Since the body rebounds with the same speed as initial.
So, final speed $u_{f} = u$
Initial speed $u_{i} = u$
Change in speed $Δ u = u_{f} - u_{i} = u - u = 0$

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