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This question already has an answer here:

If I am in a free float environment and there is another object at rest relative to me, and then I start to accelerate towards this object, do I know I am the one who is moving, since I am the one who is feeling the acceleration? If I accelerate and then start to coast at a constant speed, can I conclude that the object did not move and that the one who was moving was me, since I felt the acceleration?

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marked as duplicate by Yashas, PM 2Ring, Jon Custer, Aaron Stevens, HDE 226868 May 2 at 19:18

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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In that environment, you can always tell if you are the one experiencing an acceleration because during your acceleration, you will experience a force that you can feel. So if you keep track of that force (with an instrument called an accelerometer) while also keeping track of the distance between you and the other object, then you can tell which of you is accelerating.

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  • $\begingroup$ @PM2Ring, I did not look at them, thinking that I'd answer the question as an exercise for myself. If it offendith, I shall delete. $\endgroup$ – niels nielsen May 2 at 22:43
  • $\begingroup$ Thanks for that. How does one move an answer to the "dupe target"? $\endgroup$ – niels nielsen May 2 at 22:54
  • $\begingroup$ You have to do it manually, by copying & pasting, then deleting the original. $\endgroup$ – PM 2Ring May 2 at 22:57

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