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When they are parallel, the automobile has a positive acceleration (it is speeding up). When they are antiparallel (I assume you mean at 180 degrees to each other but in the opposite direction), the automobile has a negative acceleration (it is slowing down). When they are perpendicular they have no effect on each other, therefore the car has a constant velocity.

Q: Let v and a represent the velocity and accelerationrespestivelyof an automobileDescribe circumstances in whichv and a are parallelv and a are antiparallelv and a are perpendicular to one another?

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