Example of average velocity

This is from the material for chapter 3.  Notice that in this video, I use the following notation for components of a vector:

\vec{r} = < r_x, r_y, r_z>

This is the same (but shorter notation) as:

\vec{r} = r_x \hat{x}+ r_y \hat{y} + r_z\hat{z}

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