posted by Kendra .
A freight car is moving freely along a railroad track at 7.0 m/s and collides with a tanker car that is at rest. After the collision, the two cars stick together and continue to move down the track. What is the magnitude of the final velocity of the cars if the freight car has a mass of 1,200 kg and the tanker car has a mass of 1,600 kg?
Psychics? Are you certain? Sounds like Paranormal to me. I had a crazy aunt once who was Psychic, until she took physics. Then she combined them in learning about metaphysics.
Conservation of momentum applies
momentum before=momentum after.
solve for V