Question

what do you mean by negative and positive acceleration explain

Answer 1

The increase in velocity with respect to the timeis acceleration.
The decrease in velocity with respect to the time is deceleration or retardation. Deceleration or retardation is also known as negative acceleration.
Acceleration is a vector quantity
Deceleration is vector quantity

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Answer 2

when chenge in velocity incress cntinusly is called +ve acc and when velocity decress with time called negative aac