Formulas from these as well

Question 9 1 pts Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The combined wreck moves in a direction O at some angle other than 45 degrees. O parallel to either of the cars before collision. O at 45 degrees to the direction of either car before collision. Question 10 1 pts Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction of O the slower car. O the faster car. O neither, for they stop