Question

Find the rate at which a man weighing 60kg is working, if he climbs up a staircase, having a vertical height of 10m in half a minute.

Answer 1

Potential energy at the highest point = mgh
h = 10 m
g = 10 m/s²
m = 60 kg

P.E = 60 . 10 . 10 = 6000 j

half min = 30 s

power = energy/time = 6000/30 = 200 watt