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A body of mass m at inifnity is approach...

A body of mass `m` at inifnity is approaching the centre of a hypothetical hollow planet of mass `M` and radius `R`. The speed of the body when it passes the centre of the planet through a diametrical tunnel is

A

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

B

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

C

Zero

D

none of these

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The correct Answer is:
B
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