65. A plane flying duc cast at 200 km/h encounters a 40-km/h wind blowing in the northeast direction. The resultant velocity of the plane is the vector sum v = v1 + v2, where vị is the velocity vector of the plane and v2 is the velocity vector of the wind (Figure 30). The angle between vị and v2 is . Determine the resultant speed of the plane (the length of the vector v). 40 km/h 200 km/h FIGURE 30

65. A plane flying duc cast at 200 km/h encounters a 40-km/h wind blowing in the northeast direction. The resultant velocity of the plane is the vector sum v = v1 + v2, where vị is the velocity vector of the plane and v2 is the velocity vector of the wind (Figure 30). The angle between vị and v2 is . Determine the resultant speed of the plane (the length of the vector v). 40 km/h 200 km/h FIGURE 30