Two train cars with the same mass (30,000 kg) are traveling in the same direction when they collide. Train Car A has a velocity of 10 m/s and Train Car B has a velocity of 5 m/s. What is their total momentum after the collision? Make sure to show all your work and include proper units. 2. Jax bounced a dodgeball off a wall. The dodgeball has a momentum of 32.6 kg · m/safter the collision. What is the total momentum of the system before the collision?