Velocity-time graphs ... it covers a distance of 20 s × 12 m/s = 240 m, the area of the rectangle. From 20 to 30 seconds the car decelerates or slows to a stop at 30 seconds. The deceleration ...

A negative gradient shows the rate of “slowing down” or deceleration ... time and velocity-time graphs represent acceleration. The area under a speed-time graph represents the distance ...