Question

A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If accelerator due to gravity is 10m-2. Calculate the power expended.

Answer 1

Given:

$m=50\:\rm kg$

$h=5\:\rm m$

$t=5\:\rm s$

The power

$$P=\frac{W}{t}=\frac{mgh}{t}$$

$$P=\frac{50*10*5}{5}=500\rm\: W$$