Brady is setting up a track for his toy car to race down. The track starts at the top of a staircase that is

3.60 meters tall. At the bottom of the staircase, the car runs through a horizontal loop. The toy car has a

mass of 41.5 grams. Assume no friction is present.

At the top of the staircase, how much gravitational potential energy does the toy car have? The toy car's 4 wheels have a total contact area of. What is the pressure that the car exerts on the track?