A 64 kg hiker climbs to the top of a 3600 m-high mountain. The climb is made in 5.0 h starting at an elevation of 2500 m.
a) Calculate the work done by the hiker against gravity.
b) Calculate the average power output in watts.
c) Calculate the average power output in horsepower.
d) Calculate assuming the body is 14% efficient, what rate of energy input was required.