1.Two particles A and B have velocities 3i and vj respectively (in m/s). (a) Find the position of B relative to A for all t given that r (b relative to a) (t=0) = -9i+6j (in metres). (b) Find the value of v such that A and B collide. (c) If v=1 m/s, find the time and distance when A and B are closest together. 3. Well, firstly i drew it out. A= 3i+0j , B=0i+vj. Then I integrated A and B and let it equal to -9i+6j and I got t=3 and v=2. I also got the angle to be 33.69°. I don't know what to do after that of if anything i got is right.