light is constant speed , how we can use a certain value 3 × 10⁸ m/s for c in equation E = mc² . value of speed of light change in different units of time , nano second , micro second, minute and hour . if I use light speed relative to a hour it will be 1.08 × 10 ¹² m /s .

And this number will change the result of equation E = m c² . but in all books I have seen speed of light value is used in per second term . why ?

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