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The theory of relativity uses light speed as the theoretical maximum speed of all things in the universe. A question posed Einstein himself is as follows: "If I were on a train travelling at light speed and I walked from the rear to the front, would I not have exceeded light speed?" Einstein: "No, the force you placed on the train in order to move foreward would have slowed the train a small amount, meaning that you would not exceed light speed"

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Q: What is the reason to use speed of light in the theory of relativity?
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