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Q. A railroad car with a mass of 2 x10^4 kg moving at 3.0 m/s collides and joins with 2 railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.20 m/s.
a. what is the speed of the 3 joined cars after collision?
b. What is the decrease in kinetic energy throughout the collision?
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