Statics and Dynamics Quiz
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A railroad car of mass M=2000 kgM = 2000 \ \text{kg} rolls without friction at v0=5 m/sv_0 = 5 \ \text{m/s} to the right. Rain falls vertically at a rate such that the car accumulates mass at m˙=10 kg/s\dot{m} = 10 \ \text{kg/s}. Assume the rain has zero horizontal velocity component before hitting the car.
Which of the following correctly describes the effect of the accumulating rain on the car's horizontal velocity over time, and which physical principle is most directly responsible?
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