For the constant positive velocity graphs and the constant positive acceleration graphs, the initial displacement is zero and the initial velocity is zero.

Velocity-time graphs show how the velocity (or speed) of a moving object changes with time. These graphs also show if the object is moving at a constant speed or accelerating, decelerating, or still.

But if you calculate the acceleration without the graph, you are explicitly stating that the y-intercept is zero---which it might not be. So there are some actual reasons for making a graph.

The first parabola is for constant and positive acceleration and the second is for constant negative acceleration. Here are some things you can try.

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