Question
Thu March 07, 2013 By: Deepshikha Deepsi

where is the graviitational potential energy maximum?

Expert Reply
Mon March 11, 2013
Given that there is no reasonable criterion for preferring one particular finite r over another, there seem to be only two reasonable choices for the distance at which U becomes zero: and . The choice of at infinity may seem peculiar, and the consequence that gravitational energy is always negative may seem counterintuitive, but this choice allows gravitational potential energy values to be finite, albeit negative.
 
On that logic only answer given is surface of the earth.
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