Problem: A 9500 kg railroad car travels alone on a level frictionless track with a constant speed of 17.0 m/s . A 4550 kg load, initially at rest, is dropped onto the car. What will be the cars new speed?

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A 9500 kg railroad car travels alone on a level frictionless track with a constant speed of 17.0 m/s . A 4550 kg load, initially at rest, is dropped onto the car. What will be the cars new speed?