A freight car of mass 180,000 kg rolling down the track at

Last updated: 7/31/2022

A freight car of mass 180,000 kg rolling down the track at 16 m/s collides with two identical in mass freight cars that were initially at rest. The three cars couple together and move off together. Calculate the speed of the combination of the three cars; treat it as a perfect inelastic collision, free of any external impulses. A. 3 m/s B. 1.5 m/s C. 4.5 m/s D. None of the above.