Question

Two bodies of same mass are placed at height h and 2h above ground. Compare their gravitational potential energy. [2 marks]

Answer 1

We know that potential energy,
P.E. = mgh

We have given, $h_1$ = h, $h_2$ = 2h and mass is same for both the bodies.
Therefore from the above relation, we get,
$P.E{.}_1$ = mgh
$P.E{.}_2$ = 2mgh
[1 mark]

Hence, the potential energy of the body kept at height 2h is twice of the potential energy of the body kept at height h above the ground.
[1 mark]