We can do this by taking the integral of the acceleration function. The integral of $a(t)=0.2t$ is $\frac{t^{2}}{10}+C$. Since we know that $v(0)=0$, we can solve for the constant $C$. Plugging in these values, we get $0=\frac{0^{2}}{10}+C$, so $C=0$. Therefore,
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