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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