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A ball is thrown vertically downwards from a height of 20m with an intial velocity `v_(0)`. It collides with the ground, loses 50% of its energy in collision and rebounds to the same height. The intial velocity `v_(0)` is (Take, g =10 `ms^(-2)`)

A

`10 ms^(-1)`

B

`14 ms^(-1)`

C

`20 ms^(-1)`

D

`28 ms^(-1)`

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