(Solution) - A railroad car of mass 2 50 X 104 kg -(2025 Original AI-Free Solution)

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A railroad car of mass 2.50 X 104 kg is moving with a speed of 4.00 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.00 m/s.
(a) What is the speed of the four cars after the collision?
(b) How much mechanical energy is lost in the collision?