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29-12-2023
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 distance R/2 from centre of earth is (where R = radius of Earth and M = mass of Earth)
A.√3GM/4R
B.√2GM/3R
C.√GM/2R
D.√2GM/R

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