A man of mass 60 Kg runs up a flight of 30 steps in 40 seconds. If each step is 20 cm high, calculate the power of the man.
Given,
Mass m= 60 kg
Number of steps = 30
Height of each step = 20 cm
Time taken= 40 s
Total height h = 20×30
= 600 cm
= 6m
Total time (t) = 40×30
= 1200 s
We know,
Work done = potential energy stored
= m × g × h
Let g = 10 ms-2
So, work done will be =60×10×6
=3600 J
Substituting value or work in above formula of power:
Power of man = 3 J/s
= 3 W