Question

A 20-kg rock is on the edge of a 100-m cliff, what potential energy does the rock possess relative to the base of the cliff?

Answer 1

Answer:

2 X10⁴ J

Explanation:

Mass of the rock (m) = 20 kg

Height of the cliff (h) = 100 m

The acceleration due to gravity (g) = 10 m s⁻²

The Potential Energy of the body is given by $mgh$

$PE = mgh\\\\=> PE = 20 X 10 X 100 J = 2X 10^4 J$

The potential energy of the rock relative to the base of the cliff is 20000 J