Movimiento circular

$\mathbf{v}=\dot r \hat{\mathbf{r}}+r\dot\theta \hat{\boldsymbol{\theta}}=v_r \hat{\mathbf{r}}+v_\theta \hat{\boldsymbol{\theta}}$

$\mathbf{a}=(\ddot r-r\dot\theta^2)\hat{\mathbf{r}}+(r\ddot\theta+2\dot r\dot\theta) \hat{\boldsymbol{\theta}}$

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