A typical U.S. Army parachute has a projected diameter of 28 ft. For a payload mass of 80 kg,
(a) What terminal velocity will result at 1000-m standard altitude? For the same velocity and payload, what size drag-producing “chute” is required if one uses a square flat plate held
(b) Vertically; and
(c) Horizontally? (Neglect the fact that flat shapes are not dynamically stable in free fall.) Neglect plate weight.