If a ball is thrown straight up into the air with an initial velocity of 60 ftfs, its height in feet after t seconds is given by y : 60t 1619. (3) Find the average velocity (using 3 decimal places if necessary) for the time period beginning when t = 1 and lasting (i) 0.1 seconds. Answer: 5.84 ft/s (ii) 0.01 seconds. Answer: 0.598 W5 (iii) 0.001 seconds. Answer: 0.059 W5 (b) Based on the above results, guess what the instantaneous velocity of the ball is when t = 1. Answer: 5.84 ftfs