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A tunnel has been dug through the centre...

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 about

A

one day

B

one hour

C

42 min

D

84 min

Text Solution

Verified by Experts

The correct Answer is:
C
The particle executes SHM along the tunnel with periodic time `T=2pi(sqrt(R))/(sqrt(g))=84.6min`
`therefore` Time for journey from one end to other end
`(T)/(2)=(84.6)/(2)=42.3min`
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