When is acceleration negative?

When a object is slowing down the acceleration is the opposite direction as the velocity

Explanation:

If it is not slowing down its not negative

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this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.