A Catapult Is Designed to Launch Circus Performers from a Raised

Multiple Choice

A catapult is designed to launch circus performers from a raised platform. After launch, the height of the performer in feet is given by $h ( t ) = - 16 t ^ { 2 } + 80 t + 32$ where t is seconds after launch. After how many seconds is the performer exactly 100 feet above the Ground? Round to the nearest tenth of a second.

A) 5 seconds
B) 1.1 and 3.9 seconds
C) -0.4 and 5.4 seconds
D) 0.5 and 2.8 seconds