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)`

A ball is thrown vertically downwards from a height of 20m with an int

1.	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)`
Answer» Correct Answer - C `0.5(mgh+(1)/(2)mv^(2))=mgh` `0.25mv^(2)=0.5mgh` `v=sqrt(2gh)` `=sqrt(2xx10xx20)=sqrt(400)=20m//s`

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