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I know m*g*h is potential energy, but I also know that gravity deceases with distance avoiding to the inverse square law. I know I Just can't use the satellites current A

_{g}because that will increase as it falls towards the earth, and I'm having trouble determining exactly what that is.

This is giving me serious trouble because I want to calculate periapsis or apoapsis given just one of those two, and the velocity at that point.