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Dec28-09, 09:37 PM
P: 186
What do you mean Jsuarez when you say B changes frames, I thought we can chose where the reference frame is, can't we choose it to be B throughout it's acceleration. Also, there is another way to think of this, with the acceleration that is. The only time where there IS a difference in A and B's motion (apparently) is when B is accelerating. When this acceleration is over, NOW A and B have exactly the same motion as viewed from each to the other. Since at the end of the whole trip, B is younger than A, doesn't this mean that time dilation must have occurred during the acceleration of B, otherwise they could not have had any time differences, right?