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  4. An electron with (rest mass m0 ) moves with a speed of 8.0 c. Its mass when it moves with this speed is

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Q. An electron with (rest mass $m_{0}$ ) moves with a speed of $8.0\, c$. Its mass when it moves with this speed is

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Solution:

$m=\frac{m_{0}}{\sqrt{1-v^{2} / c^{2}}}$
$=\frac{m_{0}}{\sqrt{1-(0.8 c)^{2} / c^{2}}}=\frac{5 m_{0}}{3}$