Hi, I'm in gr. 11 physics, for a project, we have to build some kind of jumper. The "winner" is one that jumps the highest with the best weight/height ratio. Compressed gas, rockets and propellers cannot be used. Anything else is fine, like springs/elastics, I think magnets are allowed but I can't think of any way to make the whole system jump. It has to jump, not fly. I really can't think of any, and my idea is really complicated and I have no idea how I'm even going to guild it. Any ideas? Thanks.