Each of the three barges has a mass of 30 Mg, whereas the tugboat has a mass of 12 Mg. a...

Each of the three barges has a mass of 30 Mg, whereas the tugboat has a mass of 12 Mg. as the barges are being pulled forward with a constant velocity of 4 m/s, the tugboat must overcome the frictional resistance of the water, which is 2kN for each barge and 1.5 kN for the tugboat. If the cable between A and B breaks, determine the acceleration of the tugboat.