Question

A rock is lying on a rock ledge that is 3 m high. The rock as 120 J of potential energy. What is the mass of the rock?

Answer 1

$\\ \sf\Rrightarrow PE=mgh$

$\\ \sf\Rrightarrow m(10)(3)=120$

$\\ \sf\Rrightarrow 30m=120$

$\\ \sf\Rrightarrow m=4kg$

• Mass=4kg