The he Prob. 13-8 13-9. 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 2 kN for each barge and 1.5 kN for the tugboat. If the cable between A and B breaks, determine the acceleration of the tugboat. 13-12 [ tension in coefficien and block 4 m/s which cable between A and B breaks, determine the acceleration of the tugboat The AB 21N 218 AN 21N 1518 Prob. 13-9