Question

what is positive acceleration?

Answer 1

hiiii friend!!!!
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When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration. In Example B, the object is moving in the negative direction (i.e., has a negative velocity) and is slowing down.
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Answer 2

positive acceleration is actually the acceleration with positive sign. it means that a body is continuously accelerating , it is not decreasing it's velocity. it is not retardating