$v = u + at$
Where:
$v$ is the final velocity,
$u$ is the initial velocity (which is $0$ m/s since the car starts from rest),
$a$ is the acceleration ($2 \ m/s^2$),
$t$ is the time ($5$ seconds).
Substitute the given values into the equation:
$v = 0 + (2 \ m/s^2)(5 \ s)$
$v = 10 \ m/s$
Therefore, the car's velocity after $5$ seconds is $10 \ m/s$.
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