A ball is thrown downward from the top of a 140-foot building with an initial velocity of 21 feet per second. The height of the ball h after t seconds is given by the equation h=-16t^2-21t+140. How long after the is thrown will it strike the ground?

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A ball is thrown downward from the top of a 140-foot building with an initial velocity of 21 feet per second. The height of the ball h after t seconds is given by the equation h=-16t^2-21t+140. How long after the is thrown will it strike the ground?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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