\textbf{156-} A particle starts from rest with constant acceleration $\vec{a} = \hat{i} + 2\hat{j}$ and begins to move. The position vector at $t = 4$ is which of the following? (Quantities are in SI units.)
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(1) $\vec{r} = 8\hat{i} + 16\hat{j}$ \quad (2) $\vec{r} = 8\hat{i} + 12\hat{j}$ \quad (3) $\vec{r} = 4\hat{i} + 12\hat{j}$ \quad (4) $\vec{r} = 4\hat{i} + 16\hat{j}$
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