$\"\"$

The mass of a particle is $\"\"$ .

Where $\"\"$ is mass of a particle at rest and $\"\"$ is velocity of light.

Find the limit of the mass as $\"\"$ approaches $\"\"$ .

$\"\"$ .

As $\"\"$ tends to $\"\"$ from the left side, then the fraction $\"\"$ becomes $\"\"$ .

The denominator of the mass of a particle is zero, so $\"\"$ approaches to $\"\"$ . $\"\"$ .

$\"\"$ $\"\"$ .