. The y component of the velocity of a two dimensional, inviscid, incompressible flow is given by v = (4y) ft/s, where y is in ft. Determine the x component of the velocity and then find the magnitude of the velocity at x = 4 ft, y = 3 ft. Then determine expressions for the stream function (ψ) and the velocity potential (Φ). The velocity of the flow at the origin is zero.