Using Calculus, It Can Be Shown That If a Ball $h = 256 + 16 t - 16 t ^ { 2 }$

question 63

Multiple Choice

Using calculus, it can be shown that if a ball is thrown upward with an initial velocity of 16 ft/s from the top of a building 256 ft high, then its height h above the ground t seconds later will be $h = 256 + 16 t - 16 t ^ { 2 }$ During what time interval will the ball be at least 64 ft above the ground?

• A) \(2 \leq t \leq 5 \mathrm { sec }\)
• B) \(3 \leq t \leq 4 \mathrm { sec }\)
• C) \(0 \leq t \leq 4 \mathrm { sec }\)
• D) \(t \geq 4 \mathrm { sec }\)
• E) \(t \geq 5 \mathrm { sec }\)

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