Distance-time graphs can be used when objects move with uniform speed, non-uniform speed, or remain at rest.
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The motion of a freely falling body is an example of uniformly accelerated motion.
The SI unit of acceleration is meters per second squared (m/s²).
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.