a model rocket is fired vertically upward from a launching pad on the ground. Its acceleration for the first three seconds is a(t)=60 at which time the fuel is exhausted and the rocket becomes a freely "falling" body A. determine the height and velocity of the rocket at the moment when the fuel is exhausted. B. at what time does the rocket reach it's maximum height, and what is that height. C. at what time does the rocket land.