Two blocks of masses M and 3M are on a horizontal and frictionless surface. A massless spring with a spring constant of 96 N / m is attached to one of the blocks. The spring is compressed between the blocks and the blocks are tied with a massless rope as shown in the figure. After the rope holding the masses is cut, the 3M block moves to the right at 2 m / s. In this case, after the rope is cut a) What is the velocity of the block of mass M. b) If M = 0.5 kg, how much was the spring compressed before the rope was cut

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