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Question

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
20ms1
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B
40ms1
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C
5ms1
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D
10ms1
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Solution

The correct option is A $$20 ms^{-1}$$
When there is a free fall, we can directly use the equation of motion :
$$v^{2} = u^{2} + 2gh$$
here $$u = 0$$
so, $$v = \sqrt{2gh}$$ = $$\sqrt{2 \times 10 \times 20} = 20\ m/s$$

Physics

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