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A tunnel is dug along a chord of the earth at a perpendicular distance R/2 from the earth's centre. The wall of the tunnel may be assumedd to be frictionless. A particle is released from one end of the tunnel. The pressing force by the particle on the wall and the acceleration of the particle varies with x ( distance of the particle from the centre) according to

A

B

C

D

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The correct Answer is:
B, C
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