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A body moves on a coordinate line such that it has a position s = f(t) = t - 4t + 3 on the interval

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A body moves on a coordinate line such that it has a position s = f(t) = t - 4t + 3 on the interval Osts 5, with s in meters and t in seconds. a. Find the body's displacement and average velocity for the given time interval. b. Find the body's speed and acceleration at the endpoints of the interval. c. When, if ever, during the interval does the body change direction

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