JAMB Physics 2010 Paper

Concept:On a velocity–time ($v$–$t$) graph, the slope gives acceleration.A horizontal line means velocity is constant, so acceleration is zero.Explanation:Between point $F$ and point $G$, the graph is horizontal.This shows that the velocity of the car does not change during that interval.Because velocity is constant, the change in velocity is $\Delta v = 0$.Using $a = \frac{\Delta v}{\Delta t}$, the acceleration becomes $0$.Therefore, the car has no acceleration between $F$ and $G$.A sloping graph would indicate acceleration or deceleration, but the flat section $FG$ indicates uniform velocity.Answer:The car has no acceleration between point $F$ and point $G$.