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Question

A boy of mass 50 kg runs up a staircase of 45 steps in 9 s. If the height of each step is 15 cm, fimd his power. Take g=10ms2.

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Solution

Since, each step of stair case denotes 15cm
So, total height(h) of 45 steps=45×15
=675cm
=6.75m
Work done by the boy=wt×height
w=mg×h
=50×10×6.75
w=3375J
We know that,
Power(P)=workdone(w)Timetaken(T)
Power=33759Js1
Power=375w or Js1.

1183125_1209170_ans_008a9b48e9f64a75ae4c8fcb8427cb4b.jpg

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