For the two vehicles in exercise 16:
a. Sketch to scale the momentum vectors of the two vehicles prior to the collision.
b. Add the two vectors on your sketch graphically 

Data From exercise 16

A 4000-kg truck traveling with a velocity of 10 m/s due north collides head-on with a 1200-kg car traveling with a velocity of 20 m/s due south. The two vehicles stick together after the collision.