A straight line on a distance-time graph indicates uniform speed of the object.
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Distance-time graphs can be used when objects move with uniform speed, non-uniform speed, or remain at rest.
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.