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charmedbeauty
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Homework Statement
A spacecraft is in circular orbit around the earth. with respect to a point below it on earth, it is traveling towards the east with speed v.
Specify the reference state for potential energy.
Homework Equations
The Attempt at a Solution
the total energy is
E=K+U
= 1/2mv2-GmM/r
but the reference state for potential energy i don't understand?