Solution 18.8c
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(New page: From part b) we have <math>\mathbf{v}=\left( 2-\frac{t}{5} \right)\mathbf{i}+2\mathbf{j}</math> If the boat is travelling north, the <math>\mathbf{i}</math> component of the velocity mu...)
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From part b) we have
\displaystyle \mathbf{v}=\left( 2-\frac{t}{5} \right)\mathbf{i}+2\mathbf{j}
If the boat is travelling north, the \displaystyle \mathbf{i} component of the velocity must be zero.
\displaystyle \begin{align} & 2-\frac{t}{5}=0 \\ & t=10\ \text{s} \\ \end{align}
