What is the effect of motion on charge q and a mass m of an electron moving with a speed of 10⁴ m/s?

Dear Student, 
Please find below the solution to the asked query: 
$$\begin{gathered} \mathrm{Due} \mathrm{to} \mathrm{the} \mathrm{motion} \mathrm{of} \mathrm{the} \mathrm{electron}, \mathrm{it} \mathrm{possess} \mathrm{kinetic} \mathrm{energy}. \\ \mathrm{KE}=\frac{1}{2}{\mathrm{mv}}^2 \\ =\frac{1}{2}\times \left(9.1\times {10}^{-31}\right)\times {\left({10}^4\right)}^2 \\ \mathbf{=}\mathbf{4}\mathbf{.}\mathbf{6}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{23}}\mathbf{ }\mathbf{J} \end{gathered}$$
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