Question: 1 5 - 2 1 . If it takes 3 5 s for the 5 0 - M g tugboat to increase its speed uniformly

15-21. If it takes 35s for the 50-Mg tugboat to increase its speed uniformly to 25kmh, starting from rest, determine the force of the rope on the tugboat. The propeller provides the propulsion force F on the tugboat which gives it forward motion, whereas the barge moves freely. Also, determine the magnitude of F. The barge has a mass of 75Mg.
Prob. 15-21
1 5 - 2 1 . If it takes 3 5 s for the 5 0 - M g

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