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Two smooth tunnels are dug from one side...

Two smooth tunnels are dug from one side of earth's surface to the other side, one along a diameter are dropped from one end of each of the tunnels. Both time particles oscillate simple harmonically along the tunnels. Let `T_(1)` and `T_(2)` be the particle along the diameter and along the chord respectively. Then:

A

`T_(1)=T_(2)`

B

`T_(1) gt T_(2)`

C

`v_(1)=v_(2)`

D

`v_(1) gtv_(2)`

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The correct Answer is:
A, D
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