IB MAI HL Geometry & Trigonometry Topic 3.6 Vectors (id: dd0775223)

本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.6 Vectors，类别为 IB数学

[问答题]
In this question, distancesds(b,vqyy m 8-p;pa gpj*k+,f d zow:o :7f;mp+(daj sare measured in kilometres.
Two boats, $\mathrm{A}and\mathrm{B}$ , are observed from an origin $\mathrm{O}.Relativeto\mathrm{O}$, their position vectors at time t hours after midday are given by
$\begin{array}{l}{\mathbf{r}}_{\mathrm{A}}=\left(\begin{array}{c}-4\\ 3\end{array}\right)+t\left(\begin{array}{c}4\\ 3\end{array}\right)\\ {\mathbf{r}}_{\mathrm{B}}=\left(\begin{array}{c}-2\\ 9\end{array}\right)+t\left(\begin{array}{c}5\\ 0\end{array}\right)\end{array}$
Find the minimum distance between the two boats.

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