Astronaut Training A weightless environment can be created

Chapter , Problem 2.4.72

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Astronaut Training A weightless environment can be created in an airplane by flying in a series of parabolic paths. This is one method that NASA uses to train astronauts for the experience of weightlessness. Suppose the height h, in feet, of NASAs airplane is modeled by h(t) = -6.6t2 + 430t + 28,000, where t is the number of seconds after the plane enters its parabolic path. Find the maximum height of the plane to the nearest 1000 feet.

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