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Practice Test 2 - Section 2 - Calculator permitted Question & Answer Key Resources Lumos StepUp PSAT/NMSQT Practice Program - Mathematics

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A stone is thrown upward from the top of a 40 ft cliff. The height above the ground below the cliff is given by: y = 40 + 64t – 16t2 where t is measured in seconds, and the height is measured in feet.

Find the time rounded to the nearest hundredth of a second at which the stone strikes the ground below the cliff.