The system shown in figure is released from rest with spring at natural length. The spring starts extending as soon as it is released. (Neglect friction and masses of pulley, string and spring)

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At release the spring is at natural length, so it exerts no force. The block $M$ hangs only under gravity: $a_{M} = g$ (downward).

The two blocks $m$ over the pulley balance each other, so $a_{m} = 0$ . Thus $M$ moves down relative to $m$ and the spring extends for any value of $M$ .

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