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question 6. [-/2 Points] DETAILS HOLTPHYSO A railroad car with a mass of 1.89 x 10# kg moving at 3.22 m/s joins with two railroad

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6. [-/2 Points] DETAILS HOLTPHYSO A railroad car with a mass of 1.89 x 10# kg moving at 3.22 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.16 m/s. (a) What is the speed of the three joined cars after the collision? m/s (b) What is the decrease in kinetic energy during the collision

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