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QUESTION
a railroad car with a mass of 2.00 * 10^4kg is moving at 3.00m/s, each with the same mass as the single car and initially moving in the same...
a railroad car with a mass of 2.00 * 10^4kg is moving at 3.00m/s, each with the same mass as the single car and initially moving in the same direction at 1.2 m/s. what is the decrease in kinetic energy after the collision
