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Average velocity and average speed from graphs

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A dog is running in a straight line to catch a ball. Its motion is shown on the following graph of horizontal position x vs. time t.
Graph of x (in meters) vs. t (in seconds). The vertical-intercept is at 1 m, and the straight line also intersects (4, 2) and (8, 3).
What is the average velocity of the dog between the times t=2 s and t=6 s?
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