Question

Calculate the work needed for a 65 kg person to climb through 4.0 m
on the surface of (a) the Earth and (b) the Moon

Answer 1

Work = Force * Displacement
Force= Mass * acceleration due to gravity
Given :
Mass of a Person = 65 Kg
accelaration due to gravity on the surface of the earth = 9.8m/s2
Displacement of the body = 4.0 m
Work done = 65 Kg * 9.8 m/s2 * 4.0 m
= 2548 Joules
When the body is taken to the surface of the moon-----
accleration due to gravity on the surface of themoon = 1.60 m/s2
Work done = 65 Kg * 1.60 m/s2 * 4.0m
= 416 Joules


Source: http://www.chegg.com/homework-help/questions-and-answers/calculate-work-needed-65-kg-person-climb-40-mon-surface-earth-b-moon-g-160-ms-1--q318756

Answer 2

Work = change in potential energy
Potential energy = mgh.