Solve the Problem $176 \mathrm { ft } / \mathrm { sec }$

question 208

Multiple Choice

Solve the problem.
-A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of $176 \mathrm { ft } / \mathrm { sec }$ , and the gorge is $448 \mathrm { ft }$ deep, during what interval can the flare be seen?
$$\left( h = - 16 t ^ { 2 } + v _ { O } t + h _ { O } \right)$$

• A) \(8 < t < 11\)
• B) \(12 < t < 15\)
• C) \(0 < t < 4\)
• D) \(4 < t < 7\)

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