M= 2.3 kg and 2M are connected to a spring of spring constant k = 180 N/m that has one end fixed, as shown in the Figure The coefficient of kinetic friction between the horizontal surface and the block is 0.12. The pulley is frictionless and has a negligible mass. The blocks are released fromrest with the spring relaxed. 2M (a) What is the work done by the friction on the block of mass M? (b) What is the combined kinetic energy of the two blocks when the hanging block has fallen 8 cm? (c) What maximumdistance does the hanging block fall before momentarily stopping?

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