The kinetic energy of an object with mass m that moves with speed v is given by:
[tex]K=\frac{1}{2}mv^2[/tex]Plugging the mass and speed given in the equation above we have that:
[tex]\begin{gathered} K=\frac{1}{2}(9.11\times10^{31})(2.74\times10^7)^2 \\ K=3.42\times10^{-16} \end{gathered}[/tex]Therefore, the kinetic energy of the electron is:
[tex]3.42\times10^{-16}\text{ J}[/tex]