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OpenStudy (anonymous):
If an object is propelled upward from a height of s feet at an initial velocity of v feet per seconds, then its height h after t seconds is given by the equation h=-16t^2+vt+s where h is in feet. If the object is propelled from a height of 4 feet with an initial velocity of 96 feet per seconds its height h is given by the equation h=-16t^2+64t+8 After how many seconds is the height 144 feet?
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