(Answered) Question a railroad car of mass 252 x 104 kg is moving with

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Question: A railroad car of mass 2.52 x 10⁴kg is moving with a speed of3.95m/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 of1.98m/s.

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

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