the graph below shows a cyclist's velocity over a period of time.

describe the cyclist acceleration.

the acceleration of the cyclist is constant and zero
the acceleration of the cyclist is going up
the acceleration of the cyclist is constant and non zero
the acceleration of cyclist is going down.

Based on the information given, it is not possible to determine the exact acceleration of the cyclist. We can only conclude that the acceleration is either constant and zero, or constant and non-zero, based on the graph provided.