Two blocks of masses mA=8.4kg and mB=19kg are placed on  a frictionless horizantal surface. A massless spring spring is attached to the more massive block, and the two blocks are pushed together with the spring between them.  A cord initially holding the blocks together is cut and after that the blocks move in the opposite directions as shown in the figure below.  What is the velocity of the center of mass once the system is released?

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