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A tunnel is dug along the diameter of th...

A tunnel is dug along the diameter of the earth. There is particle of mass `m` at the centre of the tunnel. Find the minimum velocity given to the particle so that is just reaches to the surface of the earth. `(R =` radius of earth)

A

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

B

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

C

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

D

it will reach with the help of negligible velocity

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The correct Answer is:
A
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