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Potential Energy

A boy of mass...

Question

A boy of mass 50kg runs up a staircase of 45 steps in one second. If height of each step is 15cm, find power generated by him. (g=10 m/s²)

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Solution

Given, mass of body, m = 50 kg

h = 45 x15 = 675 cm = 6.75 m

t = 1s, g = 10 m/s2

PE = mgh = 50 x 10 x 6.75 = 3375 J

Power of the body
= PE / time
= Energy / time = 3375 / 1
= 3375W

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