An electron in a cathode$-$ray$-$tube $($CRT$)$ accelerates uniformly from $1\mathrm{.}00{10}^4\frac{m}{s}$ to $6\mathrm{.}00{10}^6\frac{m}{s}$ over $2\mathrm{.}00cm.$

$($a$)$ In what time interval does the electron travel this $2\mathrm{.}00cm?$

$\mathrm{.}000000005$

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