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OpenStudy (anonymous):
(Quadratics) a win gust blows a cone from a branch on a redwood tree. The cones's height h, in meters above the ground can be modeled by h(t)=-4.9t2-t+75. where t is the time in seconds since the cone broke from the branch. To the nearest tenth of a second, how long does the cone fall before hitting the ground?
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