The gravitational potential energy of a body of mass $m$ at the earth's surface is $-mgR_e$. Its gravitational potential energy at a height $R_e$ from the earth's surface will be (Here $R_e$ is the radius of the earth).
- A$-2mgR_e$
- B$2mgR_e$
- C$\frac{1}{2}mgR_e$
- D$-\frac{1}{2}mgR_e$
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