\f15. Which of the following points could be the initial point of vector v if it has a magnitude of 10 (1 point) and the terminal point ( 3, 3) ? (-9,-5) (Br [Q3 @0103 16. Given vectors u = (114) and v = {110), determine if the vectors are orthogonal. If they are (1 point) not orthogonal, nd the angle between the two vectors. The vectors are orthogonal. The vectors are not orthogonal. The angle between the two vectors is 91.3. The vectors are not orthogonal. The angle between the two vectors is 98.0. The vectors are not orthogonal. The angle between the two vectors is 80.6. \f18. Two forces act on an object. The rst force has a magnitude of 300 newtons and acts at an (I point) angle of 30 as measured from the horizontal. The second force has a magnitude of 150 newtons and acts at an angle of 135 as measured from the horizontal. Determine the vector v that represents the resultant force. if =(150JE?5)i+(150+?5\\/)j v = (150J+?5J)i+ (150+?5 v = (150 435:4 +(150J+?5J)j v = (150 +?5J)i+ (1503+?5Jijj 19. For it = 3i + 9j , nd unit vector u in the direction of v. (1 point) J5. 34E =1+ ] 4 4 u__J1_0i+34t10] 10 10 1. 3. u=1+] 4 4 \f