A Catapult Is Designed to Launch Circus Performers from a Raised

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 at ground level? Round to the nearest tenth of a second.

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