In one dimensional motion, the “deceleration” is defined as the acceleration which is opposite to the velocity.

What type of acceleration is deceleration?

Deceleration always refers to acceleration in the direction opposite to the direction of the velocity. Deceleration always reduces speed. ... Therefore, it has negative acceleration in our coordinate system, because its acceleration is toward the left.

Is deceleration negative or positive?

The term deceleration is generally used to indicate that the speed is reducing. Deceleration is indeed the negative of acceleration. However, you can have negative values of acceleration and declaration. You can say that a car which is accelerating at 5ms−2 is decelerating at −5ms−2.