Question

when is the acceleration taken to be negative​

Answer 1

Explanation:

Acceleration is taken to be negative when the object is being accelerated in a direction opposite to its current motion.

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Answer 2

an acceleration is negative when a object is in opposite direction.

for example-ram goes to his school from his home and then return to home

in this case when ram goes to school then the acceleration was positive and when ram comes his home from school then the acceleration was negative.