#### Answer

3 m/s

#### Work Step by Step

To find the average velocity we need to take the total displacement and divide it by the total amount of time that elapsed. From part e) we can see that the total displacement is 12m. The questions asks for the average velocity from t = 4 to t = 0, which is a total of 4 seconds. Therefore we have a displacement of 12m over 4 seconds, or in other words 12m/4s = 3m/s