511 \, \text{MeV/c}^2\)
Velocity of the electron, \(v = 0.2c\)
Calculate the Lorentz factor, \(\gamma\):
\[\gamma = \frac{1}{\sqrt{1 - \left(\frac{v}{c}\right)^2}} = \frac{1}{\sqrt{1 - 0.2^2}} = 1.02\]
Now, calculate the momentum, \(p\):
\[p = \gamma \cdot m_0
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