a 325-kg boat is sailing 15.0 north of east at a speed of 2.00 m/s. thirty seconds later, it is sailing 35.0 north of east at a speed of 4.00 m/s. during this time, three forces act on the boat: a 31.0-n force directed 15.0 north of east (due to an auxiliary engine), a 23.0-n force directed 15.0 south of west (resistance due to the water), and (due to the wind). find the magnitude and direction of the force . express the direction as an angle with respect to due east