The profile of a railway hump used at a marshalling yard is shown in Fig. 44. On a horizontal section at a distance L from the end of the slope, car 1 stands. Car 2 rolls down the hill without initial speed, and after t seconds, car 3 rolls down. At what distance from the end of the slope will all three cars be coupled? The cars are identical and equipped with an automatic coupler. Ignore friction. Slide height N.
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