# Radial Acceleration in cylindrical coordinates

## Main Question or Discussion Point

Hey guys,

Been given this formula for radial acceleration, im not sure how they derived it. I have tried but the only forumla I know is a(radial) = v^2/r

$$A_{r}$$ = $$\ddot{r}$$ - r$$\dot{\theta}^{2}$$

EDIT - should be minus not plus

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