If two particles, accelerated by a particle accelerator, collide together when they are individually very close to speed of light, so when they collide their relative speed will be more than the speed of light. So the two particles will collide at a speed more than the speed of $c$. So what will happen?
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2"when they collide their relative speed when they collide will be more than the speed of light" No, that doesn't happen. You can't just add speeds together like that in relativity. You need to use the formula here: https://physics.stackexchange.com/a/91154/123208 – PM 2Ring Jun 19 '19 at 18:35
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Your question is a little different to the suggested duplicate, but the same principle applies. – PM 2Ring Jun 19 '19 at 18:44
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why the deselection? – Árpád Szendrei Jun 20 '19 at 07:12
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As per our currently accepted theories, including SR, no particle can travel faster then light.
In your case, the particles themselves travel near the speed of light each.
AS per SR, their relative speed does not matter. There is no contradiction with SR, since, in your case, no particle travels faster then light.
Árpád Szendrei
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