The spherical rock is sitting on the edge of the cliff and has a mass of 315 kilograms. Jennie has a mass of 65 kilograms. The cliff is 216 meters tall.

Question

The spherical rock is sitting on the edge of the cliff and has a mass of 315 kilograms. Jennie has a mass of 65 kilograms. The cliff is 216 meters tall.

What is the gravitational potential energy of this rock?

Answer 1

I don't know what Jennie has to do with it but the equation for gravitational potential energy is mgh. So the gravitational potential energy of the rock relative to the bottom of the cliff is (315 kg)(9.8 m/s²)(216 m) = 666792 J.