Originally Posted By: Bill S.
Sorry, I seem to have duplicated my last post; must be something to do with my lack of technical know-how.


Haha. When I do that I prefer to blame the lack of human know-how of the people who developed the software. They should have made sure you can't accidentally do that.

Anyway, back to the twins. The situation isn't symmetric. The one who continued on still had to accelerate to turn around. If he did it slowly then he experienced a lower acceleration, but spent a longer time doing it. That means you can't necessarily make the effect arbitrarily small. If he could turn around with a small acceleration for a short time, then it would be reasonable to say that's as good as no acceleration at all.