track with initial position $8\mathrm{.}0cm,$ initial velocity $5\mathrm{.}80c\frac{m}{s},$ and constant zero acceleration.

$($a$)$ At what time, if any, do the two cars have equal speeds? $($Enter NA if the cars never have equal speeds.$)$

$s$

$($b$)$ What are their speeds at that time? $($Enter NA if the cars never have equal speeds.$)$

$c\frac{m}{s}$

blanks.$)$

$s$

$|cm$

$($e$)$ Explain the difference between question $($a$)$ and question $($c$)$ as clearly as possible.