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Step-by-step explanation:
An object which moves in the positive direction has a positive velocity.
If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion aka negative velocity.
Answer:
An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion . If velocity and acceleration have opposite signs, you slow down. Negative velocity = You move backwards. Negative acceleration - You slow down or you go faster in the backwards direction