Multiple Choice [7K marks] Identify the choice that best completes the statement or answers the question. 7. When simplified, u + 3u - 214 equals a. 617 C. 0 b. 25 d -27 3. When simplified, 2(1 + V) - 3(u - v) equals -U -V C. - 17 + 5V b. -1 - 5V 9. # = 3, v = 4, and the angle between 1/ and V (when placed tail-to-tail) is 90. Find | 1 + v|. 12 d. 25 10. 2 - 10, |V - 8, and the angle between if and V (when placed tail-to-tail) is 40. Find |2 17 - V 14.79 18 b. 12 d /464 1 1. An airplane is flying at 150 km/h on a heading of 070". The wind is blowing at 40 knyh from a bearing of 130". Find the groundspeed (the magnitude of the ground velocity) of the airplane. a 125.24 kmvh 110 knyh 190 02 km/h d. 134.54 kny/h 12. A vector extends from the origin to the point (5, 8). Find the angle that the vector makes with the positive x-axis. a. 70" C. $7.99 65 38.689 13. A child in a field runs 20 m on a bearing of 0205, then 30 m on a bearing of 090. Find the displacement of the child from her starting position. a. 50 m 36.06 m 41:36 m 25 m YALC [DF] Page 1