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A body of mass m is kept at a small height h above the ground. If the radius of the earth is R and its mass is M, the potential energy of the body and earth system (with `h=oo` being the reference position) is:
A. |
`(GMm)/R+mgh` |
B. |
`(–GMm)/R+mgh` |
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C. |
`(GMm)/R-mgh` |
D. |
`-(GMm)/R-mgh` |