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jmc

algebra intermediate

Problem

The equation describes the height (in feet) of a ball thrown upwards at feet per second from feet above the ground. Find the time (in seconds) when the ball will hit the ground. Express your answer as a common fraction.
Solution
The equation can be rewritten as . Because needs to be positive, set to represent the point where the ball reaches the ground. Therefore:
Final answer
\frac{5}{2}