If a ball is thrown straight up into the air with an initial velocity of 85 ft/s, its height in feet after t second is given by y=85t−16t2. Find the average velocity for the period beginning when t=2 and lasting
(i) 0.1 seconds
(ii) 0.01 seconds
(iii) 0.001 seconds
Finally based on the above results, guess what the instantaneous velocity of the ball is when t=2.
