A train is traveling along a straight, horizontal track at a constant speed that

Question

A train is traveling along a straight, horizontal track at a constant speed that is only slightly less than that of light. An observer in the train claims that the engine came out of a tunnel at the same time as the caboose entered the tunnel. An observer on the ground claims that the engine came out of the tunnel ____ the caboose entered.
A. at the same time as B. before C. after
A train is traveling along a straight, horizontal track at a constant speed that is only slightly less than that of light. An observer in the train claims that the engine came out of a tunnel at the same time as the caboose entered the tunnel. An observer on the ground claims that the engine came out of the tunnel ____ the caboose entered.
A. at the same time as B. before C. after
A train is traveling along a straight, horizontal track at a constant speed that is only slightly less than that of light. An observer in the train claims that the engine came out of a tunnel at the same time as the caboose entered the tunnel. An observer on the ground claims that the engine came out of the tunnel ____ the caboose entered.
A. at the same time as B. before C. after

Explanation / Answer

From the Length contraction concept, the length will look contracted to the person observing form ground as compared to the train's passenger.Hence the train is actually shorter (from ground observer's point of view).Therefore, when the engine might have come out of tunnel, the caboose was already in. So the answer is 'after'

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