A radar station, located at the origin of xz plane, as shown in the figure , detects an airplane coming straight at the station from the east. At first observation (point A), the position of the airplane relative to the origin is . The position vector has a magnitude of 360 and is located at exactly 40 above the horizon. The airplane is tracked for another 123 in the vertical east-west plane for 5.0 , until it has passed directly over the station and reached point B. The position of point B relative to the origin is (the magnitude of is 880 ). The contact points are shown in the diagram,

Question

A radar station, located at the origin of xz plane, as shown in the figure , detects an airplane coming straight at the station from the east. At first observation (point A), the position of the airplane relative to the origin is . The position vector  has a magnitude of 360  and is located at exactly 40  above the horizon. The airplane is tracked for another 123  in the vertical east-west plane for 5.0 , until it has passed directly over the station and reached point B. The position of point B relative to the origin is  (the magnitude of  is 880 ). The contact points are shown in the diagram,