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Two Identical blocks, are connected to the opposite ends of a compressed spring the blocks initially slide together on a friction less surface with a velocity v to the right. The spring is then released by remote control. At some later instant the left block is moving at v/2 to the left and the other block is moving to the right. What is the speed of the center of mass of the system at this instant? (The answer is v...please explain and derive it for me)

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