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11. The height of an object t seconds after it is launched vertically into the air is given by the position function s(t)=800t -16t2. i. Find the average velocity on the interval [4, 10]. ii. Find the instantaneous velocity when t = 7. iii. How long does it take for the object to reach its maximum height? iv. Find the maximum height. v. How long does it take the object to hit the ground? v. What is the object's velocity at the moment of impact