A box of weight $W$ is pulled by a force $P$ along a slope.
The length of the slope is $d$, and the box rises a height $h$.
The frictional force between the box and the slope is $F$.
The diagram shows the directions of the forces.
The purpose of the slope is to raise the box vertically.
Which expression gives the efficiency of the slope?
1 )
$\frac{Fd}{Wh}$
2 )
$\frac{Pd}{Wh}$
3 )
$\frac{Wh}{Fd}$
$\frac{Wh}{Pd}$
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