Relative speed

?If two different objects are interacting towards themselves at opposite direction at a speed of light both. Then will the relative speed be taken as 'c' or '2c' ?

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  • its 0.99C use relatistic vecolity formula also this question is the example of pair production
    0
  • People say light always travels at speed c.
    Light always travels at speed c relative to an inertially moving observer. (Or to an inertial frame that is momentarily moving with your observer.)
    People say that nothing can go faster than c
    Nothing can go faster than speed c relative to an inertially moving observer. (Or to an inertial frame that is momentarily moving with your observer.)
    The distance between light moving in two directions grows at speed c
    Each beam of light is moving at speed c relative to the person on the ground. So the first rule is fine. And if someone could go at speed c then we might have a problem, but no one ever claimed observers can move at speed c relative to another observer.
    So we can actually conclude that inertial frames can't move at speed c relative to an inertial frame and so therefore neither can observers.
    Your result demonstrates that not only is light speed a maximum speed for anything, it is a speed that observers can not achieve, they must always go less than c.
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