Consider the flow field formed by combining a uniform flow in the positive \(x\) direction and a source located at the origin. Obtain expressions for the stream function, velocity potential, and velocity field for the combined flow. If \(U=25 \mathrm{~m} / \mathrm{s}\), determine the source strength if the stagnation point is located at \(x=-1 \mathrm{~m}\). Plot the streamlines and potential lines.