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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 figure). When released from initial horizontal position, its instantaneous angular acceleration will be:
(1) $\frac{g}{13l}$
(2) $\frac{g}{3l}$
(3) $\frac{g}{2l}$
(4) $\frac{7g}{3l}$
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