A railroad car of mass 2.52 x104 kg is moving with a speed, Ask an Expert

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Q. A railroad car of mass 2.52 x10^4 kg, is moving with a speed of 3.94 m/s. It collides and couples with three other coupled railroad cars, each of the equal mass as the single car and moving in the equal direction with an initial speed of 1.97 m/s.

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

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

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