A boy of mass 50 kg runs up a staircase of 60 step in 9s. If the hight of each step is 15cm,find his power
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Mass of the boy(m)=50kg
Time taken (t)=9s
(h)Total height of the staircase=No of stairs×height of each step
h=60×15cm=900cm=9m
Acceleration due to gravity (g)=10m/s^2
Total work done(W)= mgh
(P)Power of the boy= W/t=mgh/t
P=(50×9×10)/9=500W
Power of the boy is 500W
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