A railroad car of mass 244 104 kg is moving with a speed of, Ask an Expert

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A railroad car of mass 2.44 104 kg, is moving with a speed of 3.96 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 1.98 m/s.

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

(b) How much energy is transformed into heat, light and sound in the collision?

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