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I am doing a presentation on energy as part of a class project.As part of the presentation I would like to physically demonstrate that the amount of work you can get out of a moving body (its kinetic energy) is equal to the amount of work you put in.I want to somehow take a moving body and get it to do a measurable amount of work that would be equal to its kinetic energy.This is turning out to be surprisingly difficult.I rigged a pinewood derby car so that I could supply a constant force over some set amount of distance.I tried running the car into a mass suspended on the end of the string and seeing how high the mass rose as a result but not all of the energy is being transferred to the mass (the car still has some velocity after impact).??Any suggestions would be greatly appreciated.