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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, equals, 2, start text, space, s, end text and t, equals, 6, start text, space, s, end text?
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