Question

A man of 60 kg carries a stone of 20 kg to a height of 30 m. Calculate the work done by the man.

Answer 1

Given; mass of the man M = 60 kg; mass of the stone m = 20kg; h = 30m; g = 10 ms^-2
∴ Total weight carried by the man,
Fg =W = (M + m)g=(60+ 20)× 10 = 800 N
∴ The work done by the man,
W = Fgh = 800 x 30
or W = 24000J
or W = 2.4 × 10⁴ J