I'm a bit confused about using dot notation; I have $A = r^2$, and I need the derivative. Would this be $\frac{dA}{dt}=\dot{r}^2$, $\frac{dA}{dt}=2\dot{r}$, or simply $\frac{dA}{dt}=2r$?
Thanks for any help!
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1$\dfrac{d(r^2)}{dt} = \dfrac{d(r^2)}{dr} \cdot\dfrac{dr}{dt} = 2r\cdot \dot{r} $ – Tony Pizza Oct 17 '23 at 18:39
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Oh yes of course, cheers! – Barney_Dinosaur Oct 17 '23 at 18:52