I have to make a car for physics..a small toy like one that runs with one elastic band. I know how to do this already, hard part is i have to make the car drop a dollar coin on a target...that's where i'm stuck. I'm not allowed to touch it to make it drop, it has to do it on it's own, like a mechanism of some sort, and at the same time it can't really weigh the car down or the car won't go very far :disgust:. Any suggestions would be much appreciated, thx.