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

question 107

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? $\left( \mathrm { h } = - 16 \mathrm { t } ^ { 2 } + \mathrm { v } _ { \mathrm { O } } \mathrm { t } + \right.$ $\mathrm { h } _ { \mathrm { O } }$ .)

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

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