Question

four persons jointly lift a 350 kg box to a height of 1m and hold it.

a) calculate the work done by the persons in lifting the box.

b) how much work do they do in just holding it?

Answer 1

Given :-

m = 350 kg
h = 1m
g = 9.8 m/s2

(a) Work done in lifting the box
= mgh
= (350) × (9.8) × (1)
= 3430 J

(b) Work done in holding the box
= mg × (0) × cosθ = 0