If a ball is thrown into the air with an initial velocity of48ft/s, its height in feet aftertseconds is given byy=48t16t².

Find the average velocity of the ball (in ft/s) for the time interval beginning att= 2 and lasting for each of the following.

(i) 0.5

(ii) 0.1

(iii) 0.05

(iv) 0.01