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A railroad car of mass 2.40 multiply.gif 104 kg is moving with a speed of 3.82 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 1.91 m/s.

(a) What is the speed of the four cars after the collision?

(...........) m/s

(b) How much mechanical energy is lost in the collision?

(..........) J

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