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A tunnel is dug across the earth of mass M and radius R at a...

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A tunnel is dug across the earth of mass M and radius R at a distance R 2 from the centre O of the Earth as shown A body is released from rest from one end of the smooth tunnel The velocity acquired by the body when it reaches the centre C of the tunnel is A 3GM 2R 3GM 8R B D 3GM 4R 3GM 16R C R 2 R

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