The summit of Mount Everest is 8850 m above sea level.
(a) How much energy would a 90 kg climber expend against the gravitational force on him in climbing to the summit from sea level?
(b) How many candy bars, at 1.25 MJ per bar, would supply an energy equivalent to this? Your answer should suggest that work done against the gravitational force is a very small part of the energy expended in climbing a mountain.