Two blocks, of masses 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-1. 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 from rest with the spring relaxed.
(a) What is the work done by the friction on the block of mass M?
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