\textbf{160-} The initial velocity vector of a projectile in SI is $\vec{V}_0 = 15\vec{i} + 20\vec{j}$. What is the displacement vector of this projectile in the first 3 seconds in SI?
($g = 10\,\dfrac{\text{m}}{\text{s}^2}$ and air resistance is negligible.)
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(1) $45\vec{i} + 15\vec{j}$ \hfill (2) $15\vec{i} - 10\vec{j}$ \hfill (3) $45\vec{i} - 10\vec{j}$ \hfill (4) $10\vec{i} + 45\vec{j}$
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