Question

Doubling an object’s height will have what effect on its potential energy due to gravity?

It will be doubled.
It will be increased four times.
It will be reduced by one-fourth.
It will be halved

Answer 1

Potential energy due to gravity = Ep = mgh [symbols have their usual meaning

Evidently, HALVING the mass will make Ep , HALF its previous value. So, It will be halved.