1.

A body of mass 45 kg climbs up 20 steps in 20 sec. If each step is 25 cm high, calculate the power used in climbing. Take g= 10 m/s2.

Answer»

Height of each step = 25 cm
No. of steps = 20
Total height = 25 × 20 = 500 cm = 5 m
Work done = m × g × h = 45 × 10 × 5 = 2250 J
Power = \(\frac { Workdone }{ Time }\) = \((\frac { 2250 }{ 20 } )\) = 112.5 Watt


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