Question

An 80kg man walks up a flight of steps to reach a height of 4m on 16 seconds.calcuate the minimum power required by man .(take g=10N kg-1).

Answer 1

Sol. W=mgh
= 80×4
= 320 J

Now,
for minimum power
power =w/t
=320/16
=20 w
so minimum 20 w power will be required to reach at 4 m high