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Escape Vrlocity help? (1 Viewer)

donthaveaname

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Feb 10, 2008
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could somebody please explain this to me. it says in a book that

loss in kinetic energy= gain in GPE
1/2(mv^2)=(GmM)/R
V=(2GM/R)^0.5

but isnt GPE meant to be negative, so why is it positive here?

thanks
 

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