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A boy standing at the top of a tower of 20 m height drops a stone. Assuming `g = 10 ms ^-2),` the velocity with which it hits the ground is

A

`5.0 m//s`

B

`10.0m//s`

C

`20.0m//s`

D

`40.0m//s`

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The correct Answer is:
C
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