Question

a man of mass 75 kg lifts a load to a height 5m. the same load was carried by a boy mass 40kg to the same height. find the ratio of the work done by two. find the ratio of the potential energy possessed by the man and the boy if they are standing at a height of 50m

Answer 1

GIVEN: mass 75 kg and mass of boy is 40 kg. height is 5 m
work done by man:
as work =mgh
so, 75×10×5=3750 N
work done by boy:
40×10×5= 2000 N
SO, ratio of their work is
3750/2000=3.75
now ratio of potential energy is
75×10×50/40×10×50
solve calculations.