\text { Is the flow with velocity field } \tilde{V}=2 x y \hat{i}-3 t^{2} x \hat{j}+5 z^{2} \hat{k} \text { (ft/s) steady or } unsteady? Is it two- or three-dimensional?

At the point (x, y, z) (1.0 ft, -2.0 ft, 0),t=1.0 sec compute: a) the velocity vector b) the local acceleration vector, c) the convective acceleration vector.