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A pendulum with time period of 1s is los...

A pendulum with time period of `1s` is losing energy due to damping. At time its energy is `45 J`. If after completing `15` oscillations, its energy has become `15 J`. Its damping constant (in `s^(-1)`) is :-

A

`1/2`

B

`1/30 In3`

C

2

D

`1/15 In3`

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