A diametrical tunnel is dug across the E...

A diametrical tunnel is dug across the Earth. A ball is 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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