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When a car stops, its instantaneous speed becomes zero.

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Q: Describe a car's instantaneous speed as it stops for a red light?
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Because when moving at the speed of light, time stops for you and you can no longer measure speed (distance covered in a certain time).


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Wouldn't an object moving at the speed of light relative to other things in space technically be at rest relative to itself and always allowed to accelerate?

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You need to know the Einsteins equation of relativity. t'=t(1-v2/c2)0.5 Basically this says the time (t') is relative to velocity (v). And C is the speed of light If v=c you get: t'=t(1-1)0.5=tx0 Therefore time stops for you when you reach the speed of light.


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If time stops at the speed of light how do photons move?

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