Motion graphs can tell you how far a body has travelled, how fast it is moving and all the speed changes there have been.
In a speed-time graph, the velocity at any time is given by the slope of tangent to the graph at the instant. If the speed is uniform, the graph inclined straight line.
velocity -time graph gives the velocity of a moving object at different time.
The acceleration at any time is given by the slope of tangent to the graph at that time
The area enclosed by the graph between a certain time interval represent the displacement of the car travelled during that time interval.
source
http://library.thinkquest.org/28388/Mechanics/Velacc/graph.htm
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