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The work done by gravitational force on ...

The work done by gravitational force on a point mass `m_0 `in moving from the surface of a planet off mass M and radius R to a height `R/2` is

A

Zero

B

`2/3 (GMm_0/R)`

C

`(-2GMm_0/3R)`

D

`(-GMm_0/3R)`

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