A railroad car of mass 2.49 104 kg, is moving with a speed of 3.89 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 1.95 m/s.(adsbygoogle = window.adsbygoogle || []).push({});

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

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

Sorry, but I have no idea about this problem :(

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# Homework Help: Inelastic Collision

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