For a distance-time graph showing a line from (0,0) to (4,20), what is the speed and its unit?

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Multiple Choice

For a distance-time graph showing a line from (0,0) to (4,20), what is the speed and its unit?

Explanation:
On a distance–time graph, speed is the slope of the line because speed is distance per unit of time. The line goes from the origin to a point where time is 4 seconds and distance is 20 meters. The slope is rise over run: 20 meters divided by 4 seconds equals 5 meters per second. Since the line is straight, the speed is constant at 5 m/s. The units come from the axes: meters for distance and seconds for time, so the unit is meters per second. The graph shows 20 m in 4 s, which directly gives 5 m/s.

On a distance–time graph, speed is the slope of the line because speed is distance per unit of time. The line goes from the origin to a point where time is 4 seconds and distance is 20 meters. The slope is rise over run: 20 meters divided by 4 seconds equals 5 meters per second. Since the line is straight, the speed is constant at 5 m/s. The units come from the axes: meters for distance and seconds for time, so the unit is meters per second. The graph shows 20 m in 4 s, which directly gives 5 m/s.

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