In figure, a block of mass \( m \) is released from rest when spring was in its natural length. ...

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In figure, a block of mass \( m \) is released from rest when spring was in its natural length. The pulley also has mass \( m \) but it is frictionless. Suppose the value of \( m \) is such that finally it is just able to lift block \( M \) up \( -\vec{M} \) after releasing it.
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