The world lines (navy blue curves) of two observers A and B who accelerate in the same direction with the same constant magnitude acceleration. At A' and B', the observers stop accelerating. The dotted lines are lines of simultaneity for observer A. Is the spacelike line segment A?B? longer than the spacelike line segment AB?

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The world lines (navy blue curves) of two observers A and B who accelerate in the same direction with the same constant magnitude acceleration. At A' and B', the observers stop accelerating. The dotted lines are lines of simultaneity for observer A. Is the spacelike line segment A?B? longer than the spacelike line segment AB?



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