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For some days I was looking for the reason that relativity said the speed of light is the maximum speed.At last after a lot of thinking I have noticed the equations below:

lim_{v[tex]\rightarrow[/tex]c}[tex]\frac{M_{0}}{\sqrt{1-\frac{v^{2}}{c^{2}}}}[/tex]=[tex]\infty[/tex]

lim_{m[tex]\rightarrow[/tex][tex]\infty[/tex]}[tex]\frac{F}{m}[/tex]=0

So if sth moved with the speed of light,It couldn'tchangeits speed.It means that not only the speed of light is the maximum speed but also When sth reaches this speed if will move with the speed of light forever.because acceleration that means the change in velocity is 0 so that thing can't increase nordecreaseits speed.

Is my reasoning right and if yes,have you noticed about it?

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# A dark part of special relativity(at least for me)

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