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Mathematics 9 Online
OpenStudy (anonymous):

A toy rocket blasts straight up off the ground with an initial velocity of 50 ft/s. How long will the rocket remain in the air? Use the formula h=-16t^2+50t where h is the height of the rocket in feet and t is the time in seconds after liftoff. Assume no air resistance, and that the rocket has no propelling force after liftoff round answer to nearest 10th A. 1.4 B. 2.8 C. 3.1 D. 4.2

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