I need to solve:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\dot{\mathbf{r}}=-kv\hat{r} - \dot{\mathbf{r}_s}[/tex]

However, I do not know how to deal with the fact that there is a unit vector. How can this be done? [itex]\dot{\mathbf{r}_s}[/itex] is a constant vector.

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# B Solving a differential equation with a unit vector in it

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