Find $\mathbf{v}(t)$ given the acceleration $$\mathbf{a}(t)=3\boldsymbol{j}$$ and initial condition $$\mathbf{v}(0)=\boldsymbol{k}.$$

$\mathbf{v}(t) =$

Usage: To enter a vector, for example $\langle x,y,z\rangle$, type "$<$ x, y, z $>$"