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Mathematics 9 Online
OpenStudy (anonymous):

A ball is thrown across a playing field from a height of h = 3 ft above the ground at an angle of 45° to the horizontal at the speed of 20 ft/s. It can be deduced from physical principles that the path of the ball is modeled by the function y = − (32/ (20)^2) x^2 + x + 3

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