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The time rate of change of the position of an object

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Yes, the radial component of the velocity vector $\dot{r}$ is 0, since the distance between the planet and the origin is simply $r$. Assuming the planet is not on a purely radial trajectory, i.e … . $\dot{\theta}$ is not zero at any point, the planet will also have velocity purely in the $e_\theta$ direction at this point. …
answered May 20 by alex1stef2