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If a distance-time graph has a slope of 3, what is the object's speed?

3 distance units per time unit

On a distance-time graph, the slope represents speed. A slope of 3 means the distance increases by 3 units for every 1 unit of time, so the speed is 3 distance units per time unit. The other numbers would correspond to different speeds (for example, a slope of 1/3 would be 1/3 distance unit per time unit, a zero slope would be no movement, and a slope of 9 would be much faster), but with a slope of 3, the object's speed is 3 distance units per time unit.

1/3 distance units per time unit

0 distance units per time unit

9 distance units per time unit