Two freight trains have a completely inelastic collision at a track crossing. Engine 1 has a mass of 1.4x10^4 kg and is initially travelling at 45 km/h [N].
Engine 2 has a mass of 1.5x10^4 kg and is initially travelling at 53 km/h [W]. Calculate the final velocity.
The Attempt at a Solution
The answer in the textbook is 9.7m/s. What am I doing wrong?