This was part of a project we did in W200 we had to address using a motion detector. We built a car out of leggos and addressed weight, wind resistance, and the height of the ramp. It was a fun project where we had to help figure out the requirements for the project. The picture above is of the graph form the car that had a ramp height at a medium position, weight, and a sail it performed as well as a non weighted car at the same height.