Answer
The final kinetic energy is $2.8\times 10^{-16}~J$
Work Step by Step
We can use conservation of energy to find the final kinetic energy $K_2$:
$K_2+U_2 = K_1+U_1$
$K_2 = U_1-U_2 + K_1$
$K_2 = -\Delta V~q +K_1$
$K_2 = -(-500~J/C)(2)(1.6\times 10^{-19}~C)+1.20\times 10^{-16}~J$
$K_2 = 2.8\times 10^{-16}~J$
The final kinetic energy is $2.8\times 10^{-16}~J$.
