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A railroad car of mass 2.46 104 kg is moving with a speed of 4.12 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 2.06 m/s.
(a) What is the speed of the four cars after the collision? (Round your answer to at least two decimal places.)
m/s
(b) How much mechanical energy is lost in the collision?
J
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