I don't think it was in my course book!-III

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

Assume that the mass of electron equals to 9.1×1031kg9.1 \times 10^{-31} \text{kg}, c=3×108 m/sc = 3 \times 10^8 \text{ m/s} .

Hint: Use the equation for relativistic mass given by Lorentz transformation.

A problem from Special Theory of Relativity
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