Answer
$1.05hp$
(Other answers are possible.)
Work Step by Step
We know that
$P=\frac{W}{t}$
$\implies P=\frac{mgh}{t}$
Let $m=80Kg$, $h=4.0m$, and $t=4.0 s$
We plug in the values into the above equation to obtain:
$P=\frac{(80)(9.8)(4.0)}{4.0}$
$P=784W$
$P=784W\times \frac{1hp}{746W}=1.05hp$
(Other answers are possible.)
