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A DIAGRAM OF velocity time graph.,distance time graph represent retsrdation,negative accleration,uniform and variable velocity on both
Case 1 : uniform and variable velocity
1.Consider the example ,a person moves in one  direction at 2 m s-1 for 6 seconds, then turns and goes the other way at 3 m s-1 for 5 seconds. The displacement -time graph is :




2. Consider the example : an object starts from rest and accelerates uniformly to a
velocity of 6 m s-1 in 15 seconds, then undergoes a constant negative acceleration so that after a further 20 seconds its velocity is -4 m s-1. The  graph of velocity - time is :


3 .The acceleration time graph for the above example is as follows :



Case 2 : Negative acceleration ::
A change of velocity is called acceleration. Speeding up, slowing down and changing direction are examples of acceleration. Illustrated in the below figure.


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