To think about the energy in the Nittany bouncer, draw bar charts showing the gravitational and spring potential as well as kinetic energies at three locations: at the very top (from where the car is released), halfway down, and at the very bottom of the car's trajectory along the track. Although you are free in general to choose the zero of potential energies to be anywhere you want them to be (only changes in potential energy matter), please use the motion sensor as the zero point of gravitational potential energy and the spring at its relaxed length (x = x,) as the zero point of elastic potential energy.