5. A single railroad car of mass 2.50x104 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 as the single car 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?

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