If a Rocket Is Propelled Upward from Ground Level, Its $- 9.8 \mathrm { t } ^ { 2 } + 98 \mathrm { t }$

question 170

Multiple Choice

If a rocket is propelled upward from ground level, its height h in meters after t sec is given by h(t) = $- 9.8 \mathrm { t } ^ { 2 } + 98 \mathrm { t }$ During what interval of time will the rocket be higher than 205.8 m ?

• A) \(0 \mathrm { sec } < \mathrm { t } < 7 \mathrm { sec }\)
• B) \(3 \mathrm { sec } < \mathrm { t } < 7 \mathrm { sec }\)
• C) \(0 \mathrm { sec } < \mathrm { t } < 3 \mathrm { sec }\)
• D) \(6 \mathrm { sec } < \mathrm { t } < 10 \mathrm { sec }\)

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