Intrinsic components from an equation of motion

A point moves with equation of motion $\vec{r}(t)=4.0t\hat{ı}+3.0t^2\hat{ȷ}$, with $\vec{r}$ in meters and $t$ in seconds. At time $t=2.0\mathrm{s}$ compute the magnitude of the velocity, the tangential and normal components of the acceleration and the radius of curvature of the trajectory.