Multiple Choice [7K marks] Identify the choice that best completes the statement or answers the question. 7. When simplified, u + 37 - 2# equals a bu b 2u d -2u 8. When simplified, 2(7 + v) - 3(u - V) equals a - 2-V C. - 1 + 5V b. -17-50 d -utv 9. [zz) - 3| v] - 4, and the angle between if and V (when placed tail-to-tail) is 90. Find | 37 + V] a 7 C. 3 b. 12 d. 25 10. # = 10. |v = 8, and the angle between ur and V (when placed tail-to-tail) is 40. Find |21 - v]. 14.79 C. 18 12 d. 464 11. An airplane is flying at 150 km/h on a heading of 070. The wind is blowing at 40 km/h from a bearing of 130. Find the groundspeed (the magnitude of the ground velocity) of the airplane. 125.24 km/h e. 1 10 km/h 190.02 km/h dL 134.54 kev/h 12. A vector extends from the origin to the point (3, 8). Find the angle that the vector makes with the positive r-axis. a. 70 37.990 b 650 d. 38 68 13. A child in a field runs 20 m on a bearing of 020", then 30 m on a bearing of 090". Find the displacement of the child from her starting position. 50 m C. 36.06 m 41.36 m d. 25 m