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Three cubes are connected to each other by massless ropes and pulled horizontally at a constant...

Three cubes are connected to each other by massless ropes and pulled horizontally at a constant speed on a rough surface. The masses of the cubes are m1 = 20 kg, m2 = 70 kg, and m3 = 20 kg. The coefficient of kinetic friction between the floor and each cube is 0.35. Find the ratio of T12/ T23.

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