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jmc

algebra intermediate

Problem

The equation describes the height (in meters) of a ball thrown upward at meters per second from meters above the ground, where is the time in seconds. In how many seconds will the ball hit the ground? Express your answer as a common fraction.
Solution
Setting to zero, we get the quadratic Multiplying both sides by we get This quadratic factors as As must be positive, we can see that
Final answer
\frac{10}{7}