The velocity field of a flow is given by \(\mathbf{V}=2 x^{2} t \hat{\mathbf{i}}+[4 y(t-1)\) \(\left.+2 x^{2} t\right] \hat{\mathbf{j}} \mathrm{m} / \mathrm{s}\), where \(x\) and \(y\) are in meters and \(t\) is in seconds. For fluid particles on the \(x\) axis, determine the speed and direction of flow.