Question

Calculate the amount of work done by a labourer who carries n bricks , each of mass m, to the roof of the house of height h by climbing up a ladder.

Answer 1

work done=f×d× cos theta

so f=ma ,=m×-10=-10m (I have taken a as retardation)

so work done = -10m ×h
=-10mh ( displacement is given as h) and angle is not given so no need to calculate it

Answer 2

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The Force exerted by the labourer in carrying $\large\blue{n}$ bricks, each of mass $\large\blue{m}$ is given by
$F = (mn)g$
= $mng\: N$

We have,
Work done $W = F×S$

Given,
The labourer carries bricks to the roof of height
$\large\blue{h}$ by climbing up a ladder

=> $S = h\: m$

Therefore
Work done by labourer $W = (mng\: Newton)×(h\: metres)$

$= mngh\: N-m$
=$mngh\: J$

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