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In the graph in Section 2.2 (pg 15), the displacement of the object between times t1 and t2 is given by the relationship
d=d2-d1 (we are not primarily concerned about the exact path taken by the object between these points. We assume that the magnitude of the displacement is given by the length of a straight line between d1 and d2 along the axis representing position)
When the displacement between two points of time (t1 and t2) is positive, that means
its magnitude is measured in the positive direction
When the displacement between two points of time (t1 and t2) is negative, that means
the displacement is negative, and its magnitude is measured in the negative direction
(slope) d/t (measured in units such as meters per second (m/s), or miles per hour (mph))
What does average velocity indicate?
how rapidly the position of the object (d) has changed over the time interval (t)
When the slope of a velocity-time graph is straight,
the acceleration in this case is constant or uniform.
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