Two trains of proper length L move toward each other in opposite directions on parallel tracks. They both move at speed v with respect to the ground. Both trains have clocks at the front and back, and these clocks are synchronized as usual in the frame of the train they are in. A tree is located on the ground at the place where the fronts of the trains pass each other. The clocks at the fronts of the trains both read zero when they pass. Find the reading on the clocks at the backs of the trains when they (the backs) pass each other at the tree. Do this in three different ways:
(a) Imagine that you stand next to the tree on the ground, and you observe what one of the rear clocks is doing.
(b) Imagine that you are on one of the trains, and you observe what your own rear clock is doing during the time the tree travels the relevant distance.
(c) Imagine that you are on one of the trains, and you observe what the other train’s rear clock is doing during the time the tree travels the relevant distance. (You’ll need to use velocity addition.)
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