Let S be the portion of the plane x−2y+z = 1 that is cut off by the coordinate planes and the plane x + y = 1. Let V be the velocity field V (x, y, z) = (y, z, x^2 ). Find the flow across S when n p

Let S be the portion of the plane x−2y+z = 1 that is cut off by the coordinate planes and the plane x + y = 1. Let V be the velocity field V (x, y, z) = (y, z, x^2 ). Find the flow across S when n points upward. Explain your answer.