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A uniform rod of length \( l \) and mass \( m \) is free to rotate in a vertical plane about \( A \). The rod initially in horizontal position is released. The initial angular acceleration of the rod is (moment of inertia of the rod about \( \mathrm{A} \) is \( \frac{m l^{2}}{3} \) ).
(1) \( m g \frac{l}{2} \)
(2) \( \frac{3 g}{2 l} \)
(3) \( \frac{2 l}{3 g} \)
(4) \( \frac{3 g}{2 l^{2}} \)
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