1. The problem statement, all variables and given/known data I have to find the speed needed to push a cart on top of a hill and I only have the height as a number. 2. Relevant equations A boy places his matchbox car at the top of the track he has set up with his brother. If the track starts atop the 55 cm toy box, descends to the floor and then up to the 75cm high bed where his brother waits for the car. How fast must the boy push his cart so it just makes it to the brother on the bed ? 3. The attempt at a solution PE = m(10m/s).55m = 55JM ?