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two light identical springs of spring co...

two light identical springs of spring constant K are attached horizontally at the two ends of a uniform horizontal rod AB of length l and mass m. the rod is pivoted at its centre 'o' and can rotate freely in horizontal plane . The other ends of the two springs are fixed to rigid supportss as shown in figure . the rod is gently pushed through a small angle and released , the frequency of resulting oscillation is :

A

`(1)/(2pi)sqrt((3k)/(m))`

B

`(1)/(2pi)sqrt((2k)/(m))`

C

`(1)/(2pi)sqrt((6k)/(m))`

D

`(1)/(2pi)sqrt((k)/(m))`

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