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A ball is thrown vertically down from a ...

A ball is thrown vertically down from a height of 40m from the ground with an initial velocity 'v'. The ball hits the ground, loses one-third of its total mechanical energy and rebuounds back to the same height. If the acceleration due to gravity is `10 ms^(-2)`, the value of 'v' is

A

`5ms^(-1)`

B

`10 ms^(-1)`

C

`15 ms^(-1)`

D

`20 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
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