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(I didn't think this would fall under homework help, I apologize if it does)

Anyway, tomorrow in school there is a house technology project, and I've been entered without doing this as a subject. I think I'll do it anyway since I do Physics.

Anyway - we have to build a small car, it is then released from rest, at the top of a slope onto a ramp. The car that goes the furthest wins. (I'm going to assume the angle is 30°)

Does anyone have any equations that could help me work out how to achieve the maximum distance? Or even any tips on the structure of the car?

I know how to do projectile motion of course, but how can I maximize the velocity at the end of the ramp?

Any help will be greatly appreciated - I'm at a huge disadvantage tomorrow and I want to make a good account for myself! Thanks guys!