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A 70kg hiker climbs to the second base camp on Nanga Parbat in Pakistan, at an altitude of 3900m, starting from the first base camp at 2200m. The climb is made in 4.7hr. Calclate the following A)the work done against gravity B) the average power output C) the rate of energy input required, assuming the energy conversion efficiency of the human body is 14%

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