How can you use a Position vs. Time graph to describe an object’s speed or direction of motion

In a position-time graph, the velocity of the moving object is represented by the slope, or steepness, of the graph line. If the graph line is horizontal, like the line after time = 5 seconds in Graph 2 in the Figure below, then the slope is zero and so is the velocity. The position of the object is not changing.

Explanation:

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this is poiselle's equation from fluid mechanic in physics. mech eng