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In which cases acceleration is positive?

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Accelaration is positive when the initial velocity is smaller than the final velocity.. Accelaration(A)= [{final velocity (V1) - initial velocity (V)} /time(t)]. Otherwise it would be negative accelaration which is known as Retardation or Deccelaration. read more

Acceleration is a vector quantity and sign of a vector quantity represents direction. generally, when the acceleration is along the velocity of the object it is considered as positive and in this case velocity is increasing. read more

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