How much work must be done to increase the speed of an electron from $($a$)0\mathrm{.}24c$ to $0\mathrm{.}27c$ and $($b$)$ from $0\mathrm{.}90c$ to $0\mathrm{.}93c?$ Note that the speed increase is $0\mathrm{.}03$ c in both cases.

$($a$)$ Number $$ Units $$

$($b$)$ Number $$ Units $$