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A body at rest starts from a point at a ...

A body at rest starts from a point at a distance r (gtR) from the centre of the Earth. If M and R stand for the speed of the body when it reaches the Earth surface is

A

`sqrt((2GM)/(R ))`

B

`sqrt((2GM)/(R-r))`

C

`sqrt((2GM(r-R))/(Rr))`

D

Zero

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The correct Answer is:
C
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