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A smart-phone is thrown upwards from the top of a 672-foot building with an initial...

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Basic Math

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A smart-phone is thrown upwards from the top of a 672-foot building with an initial velocity of 16feet per second. The height h of the smart-phone after t seconds is given by the quadratic equationh=16t + 16t+672. When will the smart-phone hit the ground?seconds

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