How much work changing gravitational potential energy


A hiker of mass 58-kg climbs up a mountain through a vertical distance of 950-m. To make the climb, her body generates an extra 4.5 X 10^6 J of energy. (a) How much work does she do in changing her gravitational potential energy? (b) What is her efficiency (expressed as a fraction between 0 and 1) in doing the work in part (a)?

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Physics: How much work changing gravitational potential energy
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