A collision occurs between a 2.00 kg particle traveling with velocity v1 = (–4.00 m/s)i + (–5.00 m/s)j and a 4.00 kg particle traveling with velocity v2 = (6.00 m/s)i + (–2.00m/s)j. The collision connects the two particles. What then is their velocity in

(a) Unit-vector notation and as a

(b) Magnitude and

(c) Angle?