Rolle’s Theorem & the Mean Value Theorem (3.2)

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Rolle’s Theorem & the Mean Value Theorem (3.2) October 20th, 2016

I. Rolle’s Theorem Thm. 3.3: Rolle’s Theorem: Let f be continuous on the closed interval [a, b] and differentiable on the open interval (a, b). If f(a) = f(b), then there is at least one number c in (a, b) such that f’(c)=0.

II. The Mean Value Theorem Thm. 3.4: The Mean Value Theorem: If f is continuous on the closed interval [a, b] and differentiable on the open interval (a, b), then there exists a number c in (a, b) such that .

Ex. 1: Use the following table of values that models the distance x(t) from Sacramento in miles and velocity v(t) in miles per hour of a train traveling from Sacramento to San Francisco to answer the following questions. Assume that the velocity of the train is a differentiable function on the interval (0,2]. Be sure to justify your reasoning. t 0.3 0.45 0.75 1 1.65 2 x(t) 10 19 42 51 74 90 v(t) 35 39 60 58 85 During the interval (0,2] hours, is there any given time at which the train is neither speeding up nor slowing down? During the interval (0,2] hours, is there any given time at which the velocity of the train is 40 mph? During the interval (0,2] hours, is there any given time at which the acceleration of the train is 70 miles per hour per hour?