Acceleration is the rate of change of velocity, meaning how quickly an object's speed or direction changes over time. It can be positive if an object speeds up, or negative if it slows down or changes direction. Acceleration is calculated by taking the change in velocity and dividing by the time elapsed, using the formula a=(Vf - Vi)/t, where a is acceleration, Vf is final velocity, Vi is initial velocity, and t is time.

1. Acceleration

7. Positive Acceleration Graph

9. Deceleration Graph