In a rail yard a freight train car moving at speed v strikes two identical cars at rest (see figure below). Neglecting any resistance to rolling, find the common velocity of the three-car system after coupling has been completed and any associated vibrations have died out. State you answer in terms of the leftmost car's velocity v. You can assume all three cars have equal mass.

In a rail yard a freight train car moving at speed v strikes two identical cars at rest (see figure below). Neglecting any resistance to rolling, find the common velocity of the three-car system after coupling has been completed and any associated vibrations have died out. State you answer in terms of the leftmost car's velocity v. You can assume all three cars have equal mass.