An electron is traveling at 99.9 percent of the velocity of light. What is its mass?
m=m01−v2c2=2.04⋅10−29 kg.m=\frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}}=2.04\cdot 10^{-29}~kg.m=1−c2v2m0=2.04⋅10−29 kg.
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