Hello! if a car(A) is moving with a speed 2m/s and another car(B) is moving in opposite direction with speed 3m/s. then velocity of car(A) with respect to (B) is 5 or -5m/s . so my question is why the same principle does not follow with speed of light as according to theory of relativity speed of light remains same from every frame of refrence ? or i can say that if i move with a speed c/2( c is the velocity of light ) opposite to the direction in which light is propogating the velocity of light w.r.t me will be 3v/2 or -3v/2. Isn't this true?