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How to solve ?

If the height of a ball at time $t$ (in secs) is defined by the position function $s=−16t_{2}+100ft$. Then, calculate the average velocity over the interval $[1,2]$ when it is dropped from 100 feet high? (a) 48 (b) -48 (c) -40 (d) 40

Given

Height of ball

time interval = [1,2]

The average velocity is given by