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A Model Rocket Is Launched from the Roof of a Building

Question 53

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A model rocket is launched from the roof of a building. For height hh , in meters, and time tt , in seconds, after the rocket is launched, the height of the rocket above the ground is given by h=f(t)=−4.9t2+42t+24h=f(t)=-4.9 t^{2}+42 t+24 . Is the graph of f(t)f(t) concave up or concave down?

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