#### A football quarterback runs 15.0 m straight down the playing field in 2.50 s. He is then hit and pushed 3.00 m straight backward in 1.75 s. He breaks the tackle and runs straight forward another 21.0 m in 5.20 s. Calculate his average velocity

(a) for each of the three intervals and

(b) for the entire motion.

**SOLUTION:**

a) The average velocity for each interval is computed using the formula

For the first interval

For the second interval

For the third interval

b) For the entire motion, we need displacement from the beggining to the end.

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