Question

Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies.

• A. 2:1
• B. 3:2
• C. 2:3
• D. 4:9

Answer 1

The correct option is C

2:3

Let ‘ m’ be the mass of the body A or B and g be the acceleration due to gravity. Then:

Potential energy of A = m x g x 20

Potential energy of B = m x g x 30

The ratio of these potential energies = m x g x 20: m x g x 30

= 20 : 30

= 2 : 3.