Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 7 - No. 21)
In a distance-time graph, how would you identify the section where the object is moving at a constant speed?
A horizontal line
A curved line
A straight line with a non-zero gradient
A line with a decreasing gradient
Explanation
A straight line with a constant gradient (slope) shows constant speed. The greater the gradient, the greater the speed.