How Do I Build a Self-propelled car?

I need to build a self-propelled car for my middle school science calss, it cant be pre-made, and it cant use a rat trap (but i can use a mouse trap) . It would help if you could provide a site with a layout,design,blueprints,etc. whatevr i would need. ive never built anything like this before, so i have no clue where to start. also, is there any keywords i could put in google that would take me to sites i could use?

Answer:
Start at the top of a hill.
Do your own homework.

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