# Velocity and Acceleration

Calculus Level 3

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 (to the nearest degree) between $$\vec{v}$$ and $$\vec{a}$$ .

×