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# A man lifts 100 boxes each of mass 15 g to a height of 1.5 m. Find the work done by the man against gravity

$\begin{array}{1 1}2250g\;J\\2240g\;J\\1250g\;J\\3250g\;J\end{array}$

The work done against gravity in lifting one box =$15g\times 1.5J=22.5g\;J$
The work done against gravity in lifting 100 boxes =$100\times 22.5g\;J=2250g\;J$
edited Sep 2, 2014