After t seconds the displacement, s(t), of a particle moving rightwards along the r-axis is given (in feet) by a(t) = 71²-21 +3. Determine the average velocity of the particle over the time interval [1, 2]. 2 average vel. = 3. average vel. - 4 average vel. - 5 average vel. = 15 ft/sec 16 ft/sec 18 ft/sec 19 ft/sec

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