Question

A boy of mass 50 kg climbs 30 steps of a staircase,each measuring 20cm high .calculate the potential energy gained by the boy

Answer 1

Mass of the boy=50kg
Height of staircase= 30*20/100=6m
Potential energy=mgh
= 50*10*6
= 3000

Answer 2

Answer:

mass of boy -50

height of the start case -30*20/100- 6cm

P. E- mgh -50*10*6 - 500*6 - 3000J

hence P. E. is 3000J