The relationship between the mass, resting mass, and speed of an electron is given as:
[tex]m=\frac{m_o}{\sqrt{1-\frac{v^2}{c^2}}}[/tex]If the mass is double the resting mass
m = 2m₀
Substitute this into the equation
[tex]2m_0=\frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}}[/tex][tex]undefined[/tex]