The slope of position versus time graph represent the velocity.
position vs. time graph attached below.
In a position-time graph, the velocity of the moving object is represented by the slope of the graph line.
So, the position vs. time graph for a person walking at a constant speed of 1 m/s for 10 seconds will be a straight line having slope of 1 in the interval of 0 to 10 seconds.
Similarly, the position vs. time graph for a person walking at a constant speed of 4 m/s for 10 seconds will be a straight line having slope of 4 in the interval of 0 to 10 seconds.
Graph attached below.
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