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What happens if a vehicle travels at a speed of light and what will be the outcomes?

Vehicles do not travel at the speed of light. Only mass less particles, like photons, may travel at the speed of light, and in fact mass less particles may travel at no other speed. An object which has some mass, like a car, requires ever more energy to accelerate it to speeds approaching the speed of light, and no matter how much energy you give the car; it will always travel at a speed less than the speed of light. So such a hypothetical question has no definite answer.


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