A diametrical tunnel is dug across the e...

A diametrical tunnel is dug across the earth. A ball dropped into the tunnel from one side. The velocity of the ball when it reaches the centre of the earth is [Given: gravitational potential at the centre of earth `= -3//2(GM//R)`]

`sqrtR`

`sqrt(gR)`

`sqrt(2.5gR)`

`sqrt(7.1gR)`

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