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Engineering 9 Online
OpenStudy (anonymous):

how do i make a lever launcher? Any website tutorials. It must throw a ping pong 14 feet and hit selected target. Something easy and not expensive.

OpenStudy (anonymous):

Maybe these sites can help (just ignore the 'science for girls' part, heehee): http://www.funscienceforgirls.com/2010/11/mini-monday-lever-launcher.html http://bgsctechclub.wordpress.com/category/lever/

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