Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 5 - No. 35)
If a vehicle is slowing down, what is the appearance of the speed-time graph?
Line has a positive slope
Line has a negative slope
Line is horizontal
Line is a curve.
Forklaring
Slowing down means velocity is decreasing, so you'll see a negative slope on a speed-time graph.