45-ton boxcar A is moving in a railroad switchyard with a velocity of 5.6 mi/h toward cars B and C, which are both at rest with their brakes off at a short distance from each other. Car B is a 25-ton flatcar supporting a 30-ton container, and car C is a 40-ton boxcar. As the cars hit each other they get automatically and tightly coupled. Determine the velocity of car A immediately after each of the two couplings, assuming that the container (a) does not slide on the flatcar, (b) slides after the first coupling but hits a stop before the second coupling occurs, (c) slides and hits the stop only after the second coupling has occurred.
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