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A tunnel is dug across the diameter of e...

A tunnel is dug across the diameter of earth. A ball is released from the surface of Earth into the tunnel. The velocity of ball when it is at a distance `(R )/(2)` from centre of earth is (where R = radius of Earth and M = mass of Earth)

A

`sqrt((3GM)/(4R))`

B

`sqrt((2GM)/(3R))`

C

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

D

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

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The correct Answer is:
A
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