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A ball is projected vertically down wit...

A ball is projected vertically down with an initial velocity from a height of `20 m` onto a horizontal floor. During the impact it loses `50%` of its energy and rebounds to the same height. The initial velocity of its projection is

A

`20 ms^(-1)`

B

`28 ms^(-1)`

C

`10 ms^(-1)`

D

`14 ms^(-1)`

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