The speed of the electron is
[tex]v=\text{ 1}\times10^7\text{ m/s}[/tex]The mass of the electron is
[tex]m=\text{ 9.11}\times10^{-31}\text{ kg}[/tex]To find the kinetic energy.
Explanation:
The kinetic energy can be calculated as
[tex]\begin{gathered} K.E.\text{ =}\frac{1}{2}mv^2 \\ =\frac{1}{2}\times9.11\text{ }\times10^{-31}\text{ kg}\times(1\times10^7)^2 \\ =4.555\text{ }\times\text{10}^{-17\text{ }}J \end{gathered}[/tex]