# SOLUTION: A ball falls from the top of a roof 320 feet above the ground. The formula h = -16t2 + 16t + 320 described the height of the ball above the ground, h, in feet, t seconds after the

Algebra ->  Algebra  -> Equations -> SOLUTION: A ball falls from the top of a roof 320 feet above the ground. The formula h = -16t2 + 16t + 320 described the height of the ball above the ground, h, in feet, t seconds after the      Log On

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 Click here to see ALL problems on Equations Question 345461: A ball falls from the top of a roof 320 feet above the ground. The formula h = -16t2 + 16t + 320 described the height of the ball above the ground, h, in feet, t seconds after the fall begins. How long will it take the ball to strike the ground?Answer by josmiceli(9697)   (Show Source): You can put this solution on YOUR website!When the ball hits the ground, , so Divide both sies by Use quadratic equation to find Take the negative square root in order to get a positive answer: sec The ball will hit the ground in 5 sec check answer: OK