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Work Done by Force of Gravity

A boy throw a...

Question

A boy throw a stone (mass $100 g$ ) vertically upwards. It reaches a height of $10 m$ and then falls to the ground. The work done by the boy is :
$(g = 10 m s^{- 2})$

10 J

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20 J

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z e r o

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- 10 J

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Solution

The correct option is A $10 J$
Given,

$m = 100 g = 0.1 k g$

$h = 10 m$

$g = 10 m / s^{2}$

The work done by the boy is,

$W = m g h$

$W = (0.1 \times 10 \times 10) J$

$W = 10 J$

The correct option is A.

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