A ball is thrown upwards from the top of a 255 foot tall building at a speed of 249 feet per second. The ball's height above ground can be modeled by the equation. When does the ball hit the ground?

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A ball is thrown upwards from the top of a 255 foot tall building at a speed of 249 feet per second. The ball's height above ground can be modeled by the equation<br><br><img src='https://www.fatskills.com/images2/GradExams/AE67D8C6-0996-4AF4-A41D-53E7F7D85381.png' height='22' width='212'/>. When does the ball hit the ground?






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