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OpenStudy (anonymous):
The function y=-16t^2+486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. How long will it take the stone to hit the ground? round to the nearest hundreadth of a second.
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OpenStudy (johnweldon1993):
Well you know that when the stone hits the ground...the height is then 0 right? so y = 0 \[\large 0 = -16t^2 + 486\] \[\large 16t^2 = 486\] Solve for 't'
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