Question

2) A 7kg rock is up 20m on a hill. Calculatethe potential energy of the rock.

Answer 1

The potential energy is given by:

`U=mgh`

where m is the mass, g is the gravity and h is the height. In this case we have:

`U=(7)(9.8)(20)=1372`

Therefore the potential energy of the rock is 1372 J.