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A ball is thrown vertically down from he...

A ball is thrown vertically down from height of 40 m from the ground with an initial velocity 'v'. The ball hits the ground, loses `(1)/(3)rt` of its total mechanical energy and rebounds back to the same height. If the acceleration due to gravity is 10 `"ms"^(-2)`, the value of 'v' is

A

`5 m^-1`

B

`10 ms^-1`

C

`15 ms^-1`

D

`20 ms^-1`

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