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A 392-kg boat is sailing 18.0° north of east at a speed of 1.90 m/s. 31.0 s later, it is sailing 35.0° north of east at a speed of 3.60 m/s. During this time, three forces act on the boat: a 32.6-N force directed 18.0° north of east (due to an auxiliary engine), a 21.1-N force directed 18.0° south of west (resistance due to the water), and (due to the wind). Find the the magnitude of , in Newtons.
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