A flat, horizontal, Frictionless railroad track has two box cars on it. Both box cars I have masses of 12,000 kg. The boxcar on the right is initially stationary, and the boxcar on the left has a velocity of 2.5 m/s to the right. The cars collide, latch together and move to the right. As a two boxcars move off to the right, a third box car with the same mass and initial velocity of the of 2.5 m/s enters from the left. He catches up to, collides with and latches onto the first two cars. The fourth car with the same mass and initial velocity enters collides with and latches, and finally a fifth again with the same mass and initial velocity. eventually five identical box cars are latched together and moving to the right. What is the velocity of the five boxcars after they have all collided and latched together?

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