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A ball is projected vertically down with...

A ball is projected vertically down with an initial velocity from a height of 20m on to a horizontal floor. During the impact it loses 50% of its energy and rebounds to the same height. The velocity of projection is `(g=10ms^(-2))`

A

`20 ms^(-1)`

B

`15 ms^(-1)`

C

`10 ms^(-1)`

D

`5 ms^(-1)`

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The correct Answer is:
A
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