t: V: y: "l = v = y = parachute opens 11 III l t = = = v y oat down t = V = = y out of fuel ground A model rocket, initially on the ground, is red vertically upward from rest. Its acceleration for the rst four secorlds is a(t) = 4815 at which time the fuel is exhausted and it becornes a \"free falling\" body (that is to say, a(t) = g). Twenty seconds later, the rocket's parachute Opens and the downward velocity slows linearly to 32 ft/sec in 8 seconds; the rocket then oats to the ground at that rate. Get the acceleration function for each stage I, II, III, IV, and ll in all the times, velocities, and altitudes