A railroad car of mass 2.49x104 kg is moving with a speed of 3.92 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 1.96 m/s. What is the speed of the four cars after the collision? (Round your answer to at least two decimal places.) How much mechanical energy is lost in the collision?

A railroad car of mass 2.49x104 kg is moving with a speed of 3.92 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 1.96 m/s. What is the speed of the four cars after the collision? (Round your answer to at least two decimal places.) How much mechanical energy is lost in the collision?

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