A ball is thrown vertically downwards fr...

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

`10 ms^-1`

`14 ms^-1`

`20 ms^-1`

`28 ms^-1`

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