Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 2 - No. 44)
What does it mean when a line on a distance-time graph has a negative gradient?
The object is accelerating.
The object is moving back toward its starting point.
The object is moving forward at a constant speed.
The object is stationary.
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Negative gradient means distance is decreasing over time, thus moving toward the origin.