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A tunnel is dug across the diameter of earth A ball is released from the...

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Physics

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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 R distance from centre of earth is where R 2 radius of Earth and M mass of Earth 1 3 3GM 4R GM an 2 2GM V 3R 2GM

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