Velocity is the rate of position change. It is the change in position divided by the time interval required for the change. The velocity of the projectile is represented by the blue arrow. The length of the arrow corresponds to the magnitude of the velocity and the direction of the arrow corresponds to the direction of the velocity. When the velocity changes, there is an acceleration.
Acceleration is the rate of velocity change.
That is the change in velocity divided by the time interval for the change. Notice that the velocity arrow of the projectile is always changing. Go back to main page.