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Question

A boy standing at the top of a tower, which is 20m high, drops a stone. Assume g = 10ms2, find the velocity with which the stone hits the ground.



A

10.0 m/s 

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B

20.0 m/s 

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C

40.0 m/s 

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D

5.0 m/s 

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Solution

The correct option is B

20.0 m/s 


We know, v2=u2+2gh
here, u = 0
Thus, v=(2gh)
v=(2×10×20)=400ms=20ms


Physics

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