This can be done using the formula for kinetic energy, which is $\frac{1}{2}mv^{2}$, where $m$ is the mass of the electron and $v$ is the velocity. Substituting the given values, we get:
\[
KE_{max} = \frac{1}{2} \times 9.1 \times 10^{-31} \times (4.2 \times
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