Velocity and Acceleration

Calculus Level pending

A particle moves according to the following movement's law:

\(\vec{r}(t)=(3{ t }^{ 2 }+5)\vec{{ E }_{ x }} - 2t\vec{{ E }_{ y }} (I.S.)\)

For \(t=1s\), calculate the angle between \(\vec{v}\) and \(\vec{a}\).

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