If people were able to travel faster than light how would they how can they see each other an prevent collision , since light moves slower>?

If you are to travel faster than the speed of light then by Einstein's Mass-Velocity Equation: M=m/(1-√(v²/c²)), where M = relativistic mass and m = rest mass.

Basically this means that as a body approaches the speed of light, its relativistic mass approaches infinity and rest mass approaches zero. If you manage to cross this universal speed limit, your rest mass would become zero and the mass would be converted to energy as per the equation E=mc².

So if you are traveling at the speed of light, you would be energy. Also if you go over i.e. travel faster than the speed of light, then flow of time would reverse and you will move back in time. This causes too many paradoxes (eg. the grandfather paradox) that there is a general consensus in the scientific community that crossing or even reaching the speed of light is not feasible.

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