16. The height, h(t), of a projectile launched upward from an initial height of 80 feet off the ground is represented by the function h(t) = -16€ + 64t + 80 where t is the number of seconds that have passed since it was launched. What is the average rate of change from t= 1 to t = 2?16. The height, h(t), of a projectile launched upward from an initial height of 80 feet off the ground is represented by the function h(t) = -16 + 64t + 80 where t is the number of seconds that have passed since it was launched. What is the average rate of change from t = 1 to t = 2?