Question

When is acceleration is taken as negative ?​

Answer 1

Answer:

retardation

Explanation:

acceleration is taken as negative in retardation or when the vehicle is going to be stop as it have its initial speed and then it will be 0 on final velocity

Answer 2

Answer:

Acceleration is taken as negative when it is either reducing the speed of the object or when it is increasing the speed of the object in the opposite direction.

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Extra info: It is also called as retardation or deacceleration