Find the angle made by the vector v = -101 + 51 with the positive x-axis and determine the unit vector in the direction of v. (b) Determine the magnitude of the resultant v = v1 + V2 and the angle which v makes with the positive x-axis, where the vectors v and v are shown in Figure 1.1.29. The magnitudes of the vectors are |vl = V = 5, |v| = V = 10, and the angles of the vectors with the positive x-axis are 0 = 30, 02 = 60.