Find the speed at which the mass of an electron is double of its rest mass.

Explanation

To find the speed at which the mass of an electron is double its rest mass, we can follow these steps:

### Step 1: Understand the relationship between relativistic mass and rest mass
The relativistic mass \( m \) of an object moving at speed \( v \) is given by the equation:
\[ m = \frac{m_0}{\sqrt{1 - \frac{v^2}{c^2}}} \]
where:
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