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A railroad car with amass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg. The cars latch together and move off with a speed of 1.2 m/s. How fast the first car moving before t
A railroad car with amass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg. The cars latch together and move off with a speed of 1.2 m/s. How fast the first car moving before the collision?
Group of answer choices2.4 m/s1.2 m/s3.6 m/s1.2 m/s