A girl of mass 40 Kg climbs a rope 6 m long at constant speed in 15 seconds. What power does she expend during the climb?

Given,

Mass m = 40 kg

Height h = 6m

Time = 15 s

Power =????

Let g = 10 ms-2

Potential energy = m × g × h

= 40×10×6 J

= 2400 J

Power = 160 J/s

So power spent by girl is 600 watts

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