Acceleration occurs when an object’s 5. changes. When an object speeds up, it has 6. acceleration. When an object’s final velocity is less than its initial velocity, however, it has 7. acceleration. An object that is changing 8. is accelerating, even if its speed remains the same. Acceleration can be calculated by dividing the change in velocity by the 9. interval in which the change occurred. The SI unit of 10. is m/s 2 . acceleration
velocity
direction
negative
positive
time