Physics help on basic kinematics?

Well the 2 concepts even though they seem related are actually a bit different. Say if you were driving down a highway and you were going 50 miles per hour, then you slammed on your breaks and reversed at 50 miles per hour back to your starting position. Your average speed would still be 50 miles per hour. But if you were traveling in one direction stopped and went in reverse, the magnitude of your average velocity would not be the same.