A. Screws, levers, pulleys, catapult.
B. GPE to PE, KE to GPE, Chemical PE to EPE, EPE to KE.
C. Paul cox did the catapult, a blog post and built the initial wood frame for the project. Tedeschi and torres attached the inclined planes and tubing and PVC work. Pavon put finishing touches on the track and did two blog posts.
By Adrian Pavon
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