6. Train car 1 has a mass of 10000 kg and is traveling to the right at 5 m/s. Train car 2 has a mass of 15000 kg and is moving to the left at 3 m/s. The two train cars collide and stick together.

• Draw a picture of the situation.

• What is the momentum of train car 1 before the collision?

• What is the momentum of train car 2 before the collision?

• What is the total momentum of the train cars before the collision?

• What is the total momentum of the train cars after the collision?

• What is the magnitude and direction of the train cars' velocity after the collision?