Question

a man of mass 50 kg climbs up stairs each of height 0.2 m in 20 seconds .calculate the power of the man​

Answer 1

Given that ,

A man whose mass is 50kg climbs up 30 steps of a stair in 30s

each step is 20 cm high

Height at 30 steps , h=30×0.2=6 m

Change in potential energy , =mgh=50×10×6=3000 J

So, Work done by the man , W=3000 J

Power used , P=

t

W

​

=

30

3000

​

=100 W

Explanation: