A boxcar of mass 568times104 kg is rolling south at 233 ms, Ask an Expert

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A boxcar of mass 5.68×10^4 kg is rolling south at 2.33 m/s when it collides with, and couples to, another boxcar of mass 5.11 x 10^4 kg which is initially at rest. After collision, what is the velocity of the coupled boxcars? Take north as positive and express the answer in three significant digits.

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