Velocity-Time graphs are simply graphs that have velocity, or speed, on the y-axis, and time on the x-axis.

If the graph is going up, then the velocity is increasing, and so the person is accelerating during that time.

If the graph is a straight line, the velocity is constant, so there is no acceleration.

If the graph is going down, then the velocity is decreasing, and so the person is decelerating during that time.

The area under the graph between any two moments in time is the distance travelled by a person over that time.

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