Question: Three objects with masses m, = 7.8 kg, m, = 12 kg, and m = 19 kg, respectively, are attached by strings over frictionless pulleys

Three objects with masses m, = 7.8 kg, m, = 12 kg, and m = 19 kg, respectively, are attached by strings over frictionless pulleys as indicated in the figure below. The horizontal surface exerts a force of friction of 30 N on my . If the system is released from rest, use energy concepts to find the speed of my after it moves down 4.0 m. m /s m

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