Question

when is the acceleration taken as negative​

Answer 1

According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.

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Answer 2

when an object is slowing down the acceleration is in the opposite direction as velocity.

Explanation:

Then the acceleration will be negative.

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