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Three objects with masses m 1 = 7.4 kg, m 2 = 14 kg, and m 3 = 19 kg, respectively, are attached by strings

Three objects with masses

m1 = 7.4 kg,

m2 = 14 kg,

and

m3 = 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 m2. If the system is released from rest, use energy concepts to find the speed of m3 after it moves down 4.0 m. answer m/s

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