Benjamin threw a rock straight up from a cliff that was 60 ft above the water. If the height of the rock​ h, in​ feet, after t seconds is given by the equation h=−16t^2+68t+60​, how long will it take for the rock to hit the​ water

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterA: Appendix
SectionA.4: Factoring And Quadratic Equations
Problem 38E: Determine the length x by solving either the equation x4=6x+5 or the equivalent equation xx+5=24.
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Benjamin threw a rock straight up from a cliff that was 60 ft above the water. If the height of the rock​ h, in​ feet, after t seconds is given by the equation  h=−16t^2+68t+60​,

how long will it take for the rock to hit the​ water?

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