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Do any of you happen to know how to derive the formula for General gravitational potential energy (not the mgh one) without using calculus? Thanks.

Just in case you guys want to know, I'm trying to derive the equation for this: http://xkcd.com/681_large/. I've got most of it, but I didn't know the formula for escape velocity so I searched it up and it led up to the formula for General Gravitational E_P. I haven't learned calculus yet, but I would still like to know how to derive it. Thanks. :D

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# Deriving the Formula for Gravitational Potential Energy

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