posted by Bettyann .
A duck flies south at a constant speed of 20 m/s. A man stands 30 meters below the duck, he fires a shot upward at an initial velocity of 30 m/s. Half a second later the duck instantly commences a constant acceleration forward of 16 meters/sec^2. How far north should the duck be at the moment the shot is fired, if the shot is to hit the duck?