# 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

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