First slide

Release from certain height

Question

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

Easy

A

10.0 m/s
B

20.0 m/s
C

40.0 m/s
D

5.0 m/s

Solution

$v = \sqrt{2 gh} = \sqrt{2 \times 10 \times 20} = \sqrt{400} = 20 m / s$

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