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Q. A boxcar of mass 200 tons at rest becomes uncoupled on a 2.5o grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?

Q. At time t = 0 s, an object is observed at x = 0 m; and its position along the x axis follows this expression: x = -3t +t3, where the units for distance and time are meters and seconds, respectively. What is the object's displacement Dx between t = 1.0 s and t = 3.0 s?

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