So, what does baseball have to do with physics? The force of the bat on the ball, the momentum of the runner rounding home, speed of the pitch, etc..... . But baseball is a perfect way describe the difference distance, displacement, position, velocity and acceleration.

Consider this, the home plate is the origin and the foul lines as the X and Y axis. The **distance** between plates is 90 feet (27.4 meters). The **position** of the of the bases are; first base is 90 feet on the X axis (on the right field foul line); third base is 90 feet on the Y axis (on the left field foul line); the second base is at 90 feet on the X axis and 90 feet on the Y axis, now lets play ball.

Batter is up to the plate, it's a hit, an infield single. The **displacement** of the runner is 90 feet in the X axis ( a magnitude of 90 feet in the direction of the X axis). The time it takes to reach first base is about 7 seconds, so the **average speed** would be 90/7 meters / seconds, or about 13 m/s. The **average velocity** is 13 m/s in the x axis.