The SI unit of acceleration is meters per second squared (m/s²).
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Acceleration is positive if it is in the direction of velocity and negative if it is opposite to the direction of velocity.
The change in velocity of an object during non-uniform motion over any time interval is not zero.
During non-uniform motion, the velocity of an object varies with time and has different values at different instants and points along the path.
The change in velocity of an object in uniform motion over any time interval is zero.