Rectilinear Motion problem. A mass starting from $x=0$ with a velocity of $1\frac{m}{s}$ has the acceleration given below. In the equation, $a$ is in $\frac{m}{s^2},$ and $x$ is in meters. Find the following.

a$.$ Its velocity after it has traveled $5$ meters.

b$.$ Its velocity after $2$ seconds.

$a=0\mathrm{.}003x^2+0\mathrm{.}02x+0\mathrm{.}1$

NEED HELP ESPECIALLY WITH b$.$