I'm just looking for feedback from anyone who can give me ideas to build a vehicle (perferably a car) that is powered by newtons' third law. its basically moving a car by recoil. any suggestions?? im thinking of something like a simple car with a ballista attached on the top. Ballista shoot back and moves car forward. but im pretty sure there are better designs out there.... the goal is try move the car as far as possible. thx.