Given,
Mass of man = 70 kg
Weight carried = 10 kg
Height above ground h = 100 m
Work done =???
Total mass at top of tower = 70 + 10
M = 80 kg
For a body of mass m to raise to height h above earth,
Work done = potential energy stored = M × g × h
Let g = 10 ms-2
So, work done will be = 80×10×100
= 80,000 J
= 80 KJ
