A particle moves with position r(t)=⟨t,t2⟩\mathbf{r}(t) = \langle t, t^2 \rangler(t)=⟨t,t2⟩. Find the acceleration vector a(t)\mathbf{a}(t)a(t).
⟨0,2⟩\langle 0, 2 \rangle⟨0,2⟩
⟨1,2t⟩\langle 1, 2t \rangle⟨1,2t⟩
⟨0,2t⟩\langle 0, 2t \rangle⟨0,2t⟩
⟨1,2⟩\langle 1, 2 \rangle⟨1,2⟩