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I just got my degree in engineering. Engineering is all about using your imagination and knowledge to create things that serve a purpose.
I recall making something like this in boy scouts. It's a mousetrap with a spoon attached.
epj.k12.sd.us/Photographs/2005-06/High-School/Catapult-Web/DSC_0150.JPG
This url or a trebuchet shows how you can use gravity
users.hubwest.com/gordo/trebuchet.JPG
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