Velocity-time graphs show how the velocity (or speed) of a moving object changes with time. These graphs also show if the object is moving at a constant speed or accelerating, decelerating, or still.

\(\Delta v\) (pronounced 'delta v' is the change in speed of the object. Acceleration is measured in metres per second per second or metres per second squared \(m\, s^{-2}\). A sprinter starting at ...

In physics the word "acceleration" includes the meaning deceleration where the direction of the acceleration is opposite to the direction of the velocity.