Solution 18.9c

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\displaystyle \begin{align} & \mathbf{a}=\frac{d\mathbf{v}}{dt}=2\mathbf{i}+(6t-24)\mathbf{j} \\ & \mathbf{F}=3\mathbf{a}=6\mathbf{i}+(18t-72)\mathbf{j} \\ \end{align}