acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. ... Because acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is also a vector quantity.
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acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. ... Because acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is also a vector quantity.