for science project need the purpose of themousetrap powered car
In the post-Apocryphal world, after petroochemical resources has been terminally exhausted and rodent control technology has selectively bred several species of uncontrollable Uber-Rodents, mousetraps will be humankind's primary energy source and means of propulsion. :)
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If you mean how to make one, look here and here first, then look here.