Lowemack

How would it affect Special Relativity if the speed of light was not a constant. What if everything in the universe had a maximum relative velocity of C. This is because as an objects velocity increases, so does its kinetic energy(which has mass), so does its total mass. This extra mass is relative to the observers velocity, so this explains the limit of relative velocity. Light also is limited to C by the same rules. But it would always appear the same to all observers because it is very close to C and when you do the reletivistic velocity additions it would appear the same. Depending how close to C lightspeed is depends how many decimal places we have to measure light to. It could be that light travels at exactly this limiting velocity so we could never measure it any differently.

Try this thought experiment. If 2 identical clocks are synchronised and then accelerated from rest to nearly C. One of them is then stopped and the other carries on at a constant velocity for a certain time period. The second one is the decelerated to a stop and accelerated back to nearly C towards the first. As it approaches the first clock accelerates up to nearly C, so they are travelling together back to the original start position where the both decelerate together to a stop. Would the clocks be synchronised. If no, why not, because the only lack of symmetry is the length of time that one moved away from the other, at close to C, and who can say which one was travelling. If they are synchronised is time reletive to velocity?