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

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) $6 \mathrm { sec } < \mathrm { t } < 10 \mathrm { sec }$