Application (18 marks) 29. A parachutist jumps out of a plane. Her height, in meters, above the ground after t seconds is given by s (t) = 1750 - 4.9t2, 0 S t - 19. a) Determine the average rate of change of the parachutist's height above the ground over the interval [2, 5]. What does this value represent? (3 marks) b) Determine the instantaneous rate of change of the parachutist's height above the ground when t= 8