The Lorentz contraction formula with velocity  is .

Where  is the length of an object.

           is the length of an object at rest.

           is the speed of the light.

Find .

As  tends to  from left side, then the fraction  becomes approximately equal to .

So the function becomes zero.

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Interpret :

As the relative speed of the object increases, the observes observes the length getting smaller and approximately equal to zero.

Lorentz contraction formula is .

The function under the square root should be greater than or equal to zero.

Left hand limit is necessary.

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