A young boy of mass 40 kg runs up a staircase of 80 steps in 25 sec. If the height of each step is 15 cm, calculate his power. (Take g = 10 m/sec)
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Given, mass of the boy, m=40kg ;
total height gained, h=50×10cm
=500cm=5m
time taken to climb, t=5s
Work done by the boy,
W=mgh=(40)(10)(5)=2000J
Power developed, P=tW=52000=400W
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