A velocity field in a fluid with density of \(1000 \mathrm{~kg} / \mathrm{m}^{3}\) is given by \(\vec{V}=(-A x+B y) t \hat{i}+(A y+B x) t \hat{j}\), where \(A=2 \mathrm{~s}^{-2}\) and \(B=1 \mathrm{~s}^{-2}\), \(x\) and \(y\) are in meters, and \(t\) is in seconds. Body forces are negligible. Evaluate \(abla p\) at point \((x, y)=(1,1)\) at \(t=1 \mathrm{~s}\).