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CalculusQ&A LibraryEXAMPLE 4If an object moves in a straight line with position function sf(t), then the average velocity betweent a and t = b isf(b)-f(a)b-aand the velocity at t = c is f'(c). Thus the Mean Value Theorem tells us that at some time t = c between a and bthe instantaneous velocity f'(c) is equal to the average velocity. For instance, if a car traveled 500 km in 5 hours,X km/h at least once.then the speedometer must have readIn general, the Mean Value Theorem can be interpreted as saying that there is a number at which theinstantaneous rate of change is equal to the average rate of change over an interval EXAMPLE 5Suppose that f(0) = -2 and f'(x) s 4 for all values of x. How large can f(3) possibly be?SOLUTIONWe are given that fis differentiable (and therefore continuous) everywhere. In particular, we can applythe Mean Value Theorem on the interval 0, 31. There exists a number c such thatf'(c)(3) - го)Sof'(c)f(3) f(0)f'(c)= -2We are given that f'(x) s 4 for all x, so in particular we know that f'(c) sMultiplying both sides of thisinequality by 3, we have 3f'(c)Sof(3) 2f'(c) -2The largest possible value for f(3) isQuestion

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