physics

A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 15.0 m/s. A 3350-kg load, initially at rest, is dropped onto the car. What will be the car's new speed?

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  1. conserve momentum
    7150*15.0 = (7150+3350)v
    v = 10.21 m/s

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    oobleck

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