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The differential equation representing t...

The differential equation representing the S.H.M. of particle is `[16 (d^2y) / dt^2+ 9y =0]` If particle is at mean position initially, then time taken by the particle to reach half of its amplitude first time will be

A

`4 pi /9 s`

B

`5 pi /9 s`

C

` pi /3 s`

D

`2 pi /9 s`

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