### Physics Problem: Mass of Water Collected in a Train Car**Problem Statement:**A 5000 kg open train car is rolling on frictionless rails at 22 m/s when it starts pouring rain. The rain is falling vertically downward, not at an angle. A few minutes later, the car's speed is 20 m/s. What mass of water has collected in the car?**Explanation:**This problem involves principles of conservation of momentum. Since there is no external horizontal force acting on the train car and the rain falls vertically, horizontal momentum must be conserved. By calculating the change in the train car's momentum due to the collected water, you can determine the mass of the rainwater that has accumulated.(Note: There are no graphs or diagrams associated with this problem.)

Law of conservation of energy: The law of conservation of energy acting on the system where the…

Answered: 2. A 5000 kg open train car is rolling…

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2. A 5000 kg open train car is rolling on frictionless rails at 22 m/s when it starts pouring rain. The rain is falling vertically downward, not at an angle. A few minutes later, the car's speed is 20 m/s. What mass of water has collected in the car?