VectorsVectors (id: 830361040)

本题目来源于试卷: VectorsVectors，类别为 IB数学

[填空题]
In this question, distance sbih ip4y*1:js are measured in kilomet dc2;5p (e:2jumekovs res.
Two boats, A and B , are observed from an origin O . Relative to O , their position vectors at time t hours after midday are given by

$\begin{array}{l}
\mathbf{r}_{\mathrm{A}}=\binom{-4}{3}+t\binom{4}{3} \\
\mathbf{r}_{\mathrm{B}}=\binom{-2}{9}+t\binom{5}{0}
\end{array}
$

Find the minimum distance between the two boats.   

参考答案: 3.79±2%


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