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.