A railroad car of mass 254 104 kg is moving with a speed of, Physics

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A railroad car of mass 254 104 kg is moving with a speed of

A railroad car of mass 2.54 104 kg, is moving with a speed of 3.91 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.

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

m/s

(b) How much energy is transformed into internal energy in the collision?

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