Solve the Problem $390 \mathrm { ft }$ High with an Initial Velocity Of

question 86

Multiple Choice

Solve the problem.
-A coin is tossed upward from a balcony $390 \mathrm { ft }$ high with an initial velocity of $16 \mathrm { ft } / \mathrm { sec }$ . During what interval of time will the coin be at a height of at least $70 \mathrm { ft }$ ?
$\left( h = - 16 t ^ { 2 } + v _ { O } t + h _ { O } \cdot \right)$

• A) \(0 \leq t \leq 1\)
• B) \(0 \leq t \leq 5\)
• C) \(4 \leq \mathrm { t } \leq 5\)
• D) \(5 \leq t \leq 10\)

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