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Question

Find the work done in lifting a stone of mass 10 Kg and specific gravity 3 from the bed of a lake to a height of 6 m in water.

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Solution

Given,
$m = 10 k g$
$h = 6 m$
$g = 3 k g / m^{2}$
Work done, $W = m g h$
$W = 10 \times 3 \times 6$
$W = 180 J$

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