A body is dropped from a tower with zero velocity reaches ground in $4 s$ . The height of the tower is about:-

80 m

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20 m

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160 m

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40 m

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Solution

The correct option is A $80 m$
substitute the value in given formula
$s = 0 * t + \frac{1}{2} * 9.8 * 4^{2} = 78.4 ≅ 80 m$
The height of the tower is about $80 m$

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