#### 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:**

### Part A

The average velocity for each interval is computed using the formula

For the first interval

For the second interval

For the third interval

### Part B

For the entire motion, we need displacement from the beginning to the end.