Problem: A 2.00×104 kg railroad car is rolling at 4.00 m/s when a 5000 kg load of gravel is suddenly dropped in. What is the cars speed just after the gravel is loaded?

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A 2.00×104 kg railroad car is rolling at 4.00 m/s when a 5000 kg load of gravel is suddenly dropped in. What is the cars speed just after the gravel is loaded?