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A rigid massless rod of length 3l has tw...

A rigid massless rod of length `3l` has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis (see figuare). When released from initial horizontal position, its instantaneous angular acceleration will be

A

`(g)/(13l)`

B

`(g)/(3l)`

C

`(g)/(2l)`

D

`(7g)/(3l)`

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