A railroad car with a mass 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 was the first car moving before the collision?

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The Answer of A railroad car with a mass 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 was the first car moving before the collision?

A Railroad Car with a Mass of 20,000 Kg Rolls