Why is it not possible to achieve speed more than that of light?

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Solution

Einstein once called the speed of light “The Universe’s speed limit”. He claimed that traveling faster than the speed of light would violate the causality principle. For the layman, that means cause and effect. An example of this would be a bullet hitting a target before the trigger was even pulled.

Accelerating to light speed or exceeding it would also violate certain fundamental energy conditions. It could even allow for time travel.

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