A pulley fixed to the ceiling carries a string with blocks of masses \( \mathrm{m} \) and \( 3 \....

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A pulley fixed to the ceiling carries a string with
\( \mathrm{P} \)
blocks of masses \( \mathrm{m} \) and \( 3 \mathrm{~m} \) attached to its ends.
The masses of string and pulley are negligible.
When the system is released, the acceleration of center of mass will be
(1) Zero
(2) \( -\frac{g}{4} \)
(3) \( \frac{g}{2} \)
(4) \( -\frac{g}{2} \)


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