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A ball of mass 50 g is dropped from a he...

A ball of mass 50 g is dropped from a height of 20 m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 200 N, so that it attains a vertical height of 45 m. The time for which the ball remains in contact with the bat is [Take `g=10m//s^(2)]`

A

`1//20^(th)` of a second

B

`1//40^(th)` of a second

C

`1//80^(th)` of a second

D

`1//120^(th)` of a second

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