Moontanman Posted May 1 Report Share Posted May 1 If two space craft were approaching each other at 99.999% of the speed of light, what would the speed of each appear to be to the other since the speeds would not add up like two trains traveling at 100 mph toward each other. Quote Link to comment Share on other sites More sharing options...
oldpaddoboy Posted May 1 Report Share Posted May 1 1 hour ago, Moontanman said: If two space craft were approaching each other at 99.999% of the speed of light, what would the speed of each appear to be to the other since the speeds would not add up like two trains traveling at 100 mph toward each other. Can't help too much as I am mathematically ignorant, but length contraction and time dilation are what is relevant. Moontanman 1 Quote Link to comment Share on other sites More sharing options...
pzkpfw Posted May 2 Report Share Posted May 2 (edited) They got good answers here: (link removed) (There was an issue in that the question was a bit vaguely worded, so it went in circles a bit.) Edited May 2 by Moontanman Quote Link to comment Share on other sites More sharing options...
Moontanman Posted May 2 Author Report Share Posted May 2 10 hours ago, pzkpfw said: They got good answers here: https://www.scienceforums.net/topic/133912-combined-speeds-at-relativistic-velocities/ (There was an issue in that the question was a bit vaguely worded, so it went in circles a bit.) Please do not direct to another forum on here, link is removed. Quote Link to comment Share on other sites More sharing options...
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