A ball is thrown up and attains a maximum height of 100 m. Its initial speed was.

9.8 m s^{- 1}

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44.2 m s^{- 1}

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19.6 m s^{- 1}

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none of these

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Solution

The correct option is B $44.2 m s^{- 1}$
Maximum height attained $H = 100 m$
Initial speed $u = \sqrt{2 g H}$
$⟹ u = \sqrt{2 \times 9.8 \times 100} = 44.2 m / s$

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