A stone dropped from the top of the tower touches the ground in 4 sec. The

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A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about

Options:

A . 80 m

B . 40 m

C . 20 m

D . 160 m

Answer: Option A
:
A
We have,

h = \frac{1}{2} g t^{2} = \frac{1}{2} \times 10 \times (4)^{2} = 80 m

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