M1 (10 points) Collision A pink sticky ball going south collides with a green sticky ball going west. The mass of each sticky ball is 1.5 kg. After the collision, both balls get stuck to each other, and they move at 2.5 "/s in a direction 40 south of west.(a) Is the collision elastic, inelastic, or completely inelastic? {circle one best choice} (2 pts) Elastic Inelastic Completely Inelastic (b) Find the velocity vector (magnitude and direction) of the pink ball before the collision. (4 pts) (c) Find the velocity vector (magnitude and direction) of the green ball before the collision. (4 pts)