Question

A boy of mass 50kg runs up a staircase of 45 steps in 9s. If the height of each step is 15cm, find his power. Take g=10 m s-2.

Answer 1

The power spent by the person = energy spent / time duration

      = m g h / t  

        = 50 * 10 * (15/100)  / 9  Watts

        = 8.33 Watts

Answer 2

Answer:

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