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Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in the figure below. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is μk = 0.28. Determine the change in the kinetic energy of block A as it moves from C to D, a distance of 18 m up the incline if the system starts from rest.

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    I do not understand what the picture is.

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