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The height (feet) of a ball launched in the air t seconds after it is launched is given by: f (t ) = - 16t2

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The height (feet) of a ball launched in the air t seconds after it is launched is given by: f (t ) = - 16t2 + 368t + 8. After how many seconds is the ball falling at 140 feet per second? sec. If necessary, round to two decimal places. If there is more than one correct answer, separate them with commas

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