hi, i need answers on the questions below. please provide explanation or solution if needed so i can better understand it. thank youu.

3. You are to program a robotic arm on an assembly line to move in the xy-plane. Its first displacement is A; its second displacement is B, of magnitude 10.00 cm and direction 74.2 deg measured in the sense from the +x-axis toward the -y-axis. The resultant C = A + B of the two-displacement s should also have a magnitude of 10.00 cm, but a direction 41.6 deg measured in the sense from the +x-axis toward the ty- axis. (a) Find the magnitude of A A. 6.87 cm B. 7.18 cm C. 9.45 cm D. 11.44 cm E. No Answer (b) Find the angle of vector A from the +x-axis A. 52.2 deg B. 57.1 deg C. 62.8 deg D. 65.4 deg E. No Answer9. Please refer to the following vectors: A = 6i + 2j - 3k B = 3i - j - 2k C=-i+ j - 4k D = j - 3k E=-i+ 2k F = -5k G = 2i H = -3j 1 = -4i +4j A man went into hiking and traveled with the following displacement vectors: B, C, H, I. Find the resultant displacement: A. -201 -12j +15k B. -21-7j-6k C. +11i -11j-6k D.+5i +15j -20k E. No Answer12. For bodies that are falling, to achieve terminal velocity, what must happen to the acceleration of the body? a. The acceleration of the body is remains the same through time. b. The acceleration of the body must decrease over time c. The acceleration of the body must equal to the acceleration due to gravity. d. The acceleration of the body must increase over time. No Answer20. Relate the two objects (A and B) that start at x = 0 att =0 and move in one dimension independently of one another. The graphs of the velocity of each object vs. time are shown below. (A) Which moves with constant non-zero acceleration? Velocity (m/s) Velocity (m/s) Time ($) Time ($) A. A B. B C. Both A and B D. Neither A nor B E. No Answer23. Please refer to the following vectors: A = 6i + 2j - 3k B = 3i - j - 2k C=-i+ j - 4k D = j - 3k E =-i+ 2k F =-5k G = 2i H = -3j 1 =-4i +4j Solve 5(1 x H) + 3*(B . C x E) A. Bi - 9j - 4k B. -61 -6j +54k C. 12i + 72j +5k D. -20i - 20j - 147k E. No