1.

A rail road car of mass 2 × 10⁴ kg moving with a speed of 5 m/s collides and couples with three other coupled rail road cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2 m/s. (a) What is the speed of the four cars after collision? (b) How much energy is lost in the collision?​

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