A 9.3 m long ramp is set at an angle of 18° with the floor. A 140 kg couch is pushed up
the ramp. What is the change in GPE of the couch? (Hint: a bit of a challenge. We
need to know how high that ramp is. We'll need SOH CAH TOA for that. Once you
know the height of the ramp then it's just mgh to find the GPE)