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(A) The system consists of two blocks $A$ and $B$ connected by a spring. When the system is released,the only forces acting on the blocks are the inte

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The centre of mass of the system will remain stationary.

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(A) The system consists of two blocks $A$ and $B$ connected by a spring. When the system is released,the only forces acting on the blocks are the internal spring forces.Since there is no external force acting on the system in the horizontal direction,the net external force on the system is zero $(F_{ext} = 0)$.According to the property of the centre of mass,if the net external force on a system is zero,the acceleration of the centre of mass is zero $(a_{cm} = 0)$.If the system was initially at rest,the velocity of the centre of mass remains zero,meaning the centre of mass remains stationary.

Two blocks $A$ and $B$ are joined together with a compressed spring. When the system is released,the two blocks move with unequal speeds in opposite directions as shown in the figure. Select the correct statement.

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