A guy (of body mass ) jumps out of a horizontally flying plane of speed at height . The horizontal component of the jumper's initial velocity is equal to that of the plane's and the jumper's initial vertical component of his velocity is 0. The air resistance to the jumper is a( ?v) where ?(v)= √(vx^2+vy^2) is the magnitude of jumper's velocity. Please compute the jumper's velocity as a function of height.