what you mean by acceleration
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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. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing.
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Acceleration is rate of change of velocity with time. It is denoted by 'a' and the SI unit is m/s2. Average acceleration is change of velocity over a time interval.
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