Question

A
line on a distance-time graph indicates constant speed because it shows the same change in
each second.

Answer 1

That's correct! On a distance-time graph, a straight line indicates that an object is moving at a constant speed. This means that the object's distance changes by the same amount in each unit of time. If the line is sloped, the steeper the slope, the faster the speed. Conversely, if the line is horizontal, it indicates that the object is at rest, with no change in distance over time. A curve on the graph, however, would indicate that the speed is changing (either speeding up or slowing down).