Solve the Problem $\mathrm { f } ( \mathrm { t } ) = 189 - 32 \mathrm { t } \mathrm { ft } / \mathrm { sec }$

question 114

Multiple Choice

Solve the problem.
-A toy rocket is launched straight up from level ground. Its velocity function is $\mathrm { f } ( \mathrm { t } ) = 189 - 32 \mathrm { t } \mathrm { ft } / \mathrm { sec }$ , where $\mathrm { t }$ is the number of seconds after launch. At what time does the rocket reach its maximum height?

• A) \(6.23 \mathrm { sec }\)
• B) \(5.72 \mathrm { sec }\)
• C) \(5.91 \mathrm { sec }\)
• D) \(11.81 \mathrm { sec }\)

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