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Double light speed
Someting almost faster than light traveling on something else almost faster than light

Well I've been wondering quite a long time about this problem. If you had let's say 10 rockets, each of them having a length enough to provide space for an acceleration of another rocket inside. Each rocket would accelerate from 0, to 1/10 of speed of light. From the observers point of view, wouldn't the last rocket achieve the speed of light (since the speeds add up).


marked as duplicate by Qmechanic, dmckee Sep 21 '12 at 20:43

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  • $\begingroup$ I know that you need infinite energy to accelerate an object of a certain mass to the speed of light, but the rockets, are not even approaching the speed, so that doesn't work here. $\endgroup$ – Bartlomiej Lewandowski Sep 21 '12 at 20:36
  • $\begingroup$ so what you are saying, that comparing the speeds of rocket 9,10 ,their speed difference would be much smaller than 1/10 of the speed of light, but from the rocket nr 10 point of view, the difference would be exactly 1/10 speed of light $\endgroup$ – Bartlomiej Lewandowski Sep 21 '12 at 20:42