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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

[tex]A_{r}[/tex] = [tex]\ddot{r}[/tex] - r[tex]\dot{\theta}^{2}[/tex]

EDIT - should be minus not plus

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# Radial Acceleration in cylindrical coordinates

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