Question

Find the ratio of potential energy if an object is raised to thrice of its height and its mass is tripled.

(a) 1:1

(b) 1:4

(c) 1:9

(d) 1:3

The question was posed to me in unit test.

This interesting question is from Potential Energy topic in division Work, Energy and Power of Physics – Class 11

Answer 1

Correct answer is (c) 1:9

To elaborate: PE1 = m x g x h

PE2 = (3m) x g x (3h)

 = 9 x m x g x h

PE1 : PE2 = mgh : 9mgh

 = 1:9.