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Mathematics 20 Online
OpenStudy (anonymous):

If an object is propelled upward from a height of s feet at an initial velocity of v feet per second, 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 8 feet with an initial velocity of 64 feet per second, its height h is given by the equation h=-16t^2+64t+8. After how many seconds is the height 36 feet?

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