Example: Using the gradient or slope of a distance - time graph to work out the speed of an object Calculate the speed of the object represented by the green line in the graph below, from 0 to 3 s.

Distance-time graphs show how the distance travelled ... average speed = total distance ÷ total time = 7 m ÷ 10 s = 0.7 m/s. The speed of the vehicle following the purple line for the first ...