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Active Calculus - Gvsu - Grand Valley State University

Active Calculus - Gvsu - Grand Valley State University

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4.4. THE FUNDAMENTAL THEOREM OF CALCULUS 107Activity 4.12.During a 30-minute workout, a person riding an exercise machine burns calories at a rate ofc calories per minute, where the function y = c(t) is given in Figure 4.9. On the interval 0 ≤t ≤ 10, the formula for c is c(t) = −0.05t 2 + t + 10, while on 20 ≤ t ≤ 30, its formula isc(t) = −0.05t 2 + 2t − 5.15cal/miny = c(t)10510 20 30minFigure 4.9: The rate c(t) at which a person exercising burns calories, measured in calories perminute.(a) What is the exact total number of calories the person burns during the first 10 minutesof her workout?(b) Let C(t) be an antiderivative of c(t). What is the meaning of C(30) − C(0) in the contextof the person exercising? Include units on your answer.(c) Determine the exact average rate at which the person burned calories during the 30-minute workout.(d) At what time(s), if any, is the instantaneous rate at which the person is burning caloriesequal to the average rate at which she burns calories, on the time interval 0 ≤ t ≤ 30?⊳

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