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Certa partícula descreve a trajetória em \mathbb{R}^3 definida por  \vec{r}...

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Certa partícula descreve a trajetória em \mathbb{R}^3\mathbb{R}^3 definida por 

\vec{r}(t)=(-t^2+ t^3)\,\vec{i}+3 t^3\,\vec{j}+t\,\vec{k}\vec{r}(t)=(-t^2+ t^3)\,\vec{i}+3 t^3\,\vec{j}+t\,\vec{k} onde t\in\mathbb{R}t\in\mathbb{R} designa cada instante.  

Determine, caso exista, o instante em que o vetor velocidade é (0,4,1).(0,4,1).

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