Deceleration

Slowing down: the magnitude of an object's velocity decreases.

A reduction in the velocity of an object; its magnitude describes how quickly the object slows down.

Acceleration that acts opposite to an object's velocity and therefore reduces its speed.

Acceleration opposite to the direction of motion, causing an object's speed to decrease.

Acceleration opposite to an object's velocity, causing its speed to decrease.

A change in velocity in which the magnitude of the velocity decreases.

Acceleration that reduces an object's speed; it may be described as negative acceleration when a positive direction has been chosen.

Acceleration in the opposite direction to an object's motion, causing its speed to decrease.

Acceleration that reduces an object's speed; it gives a negative value when the direction of motion is taken as positive.

Acceleration acting opposite to an object's velocity, causing its speed to decrease.