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A stone is tossed into the air from round level with an initial velocity of 38 m/s. its height at time is h(t) = 38t-4.9t²m. Compute the stone's average velocity v in m/s over the time intervals [2, 2.01], [2, 2.001], [2, 2.0001] and [1.9999, 2], [1.999, 2], [1.99, 2).