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Homework Statement
Object A is at rest relative to the Earth and we want to put it in orbit around the earth, how much energy is necessary to do so?
Homework Equations
Ki+Ui=Kf+Uf+energy input[/B]
The Attempt at a Solution
what i don't understand is, if the body is at rest, Ki=0, but don't we need a certain inicial velocity to put it in orbit? So shouldn't Ki have a value?[/B]