Q.

A tunnel has been dug through the centre of the earth and a ball is released in it. It will reach the other end of the tunnel after

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a

84.6 minutes

b

42.3 minutes

c

1 day

d

Will not reach the other end

answer is B.

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Detailed Solution

Ball execute S.H.M. inside the tunnel with time period  T=2πRg=84.63 minHence time to reach the ball from one end to the other end of the tunnel t=84.632=42.3 min.
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