The gradient or the steepness of the graph can be used to work out the acceleration ... ie your answer must be fairly long. From 0 to 20 seconds the vehicle is at a constant speed of 12 m/s.
The speed-time graph in the question below shows ... Therefore, according to the definition, the bus has an acceleration. CD - the speed of the bus is \(0 m\,s^{-1}\) over this section.
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