When the velocity is changing, the position-vs.-time graph is a curved line. The slope x/ t of the tangent line drawn to the curve at a given time is the instantaneous velocity at that time.
Figure 2.23  When the velocity is changing, the position-vs.-time graph is a curved line. The slope D x/D t of the tangent line drawn to the curve at a given time is the instantaneous velocity at that time.


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