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A group of students launches a model rocket in the vertical direction. Based on tracking data, they determine that

the vertical height of the rocket is governed by $y=100t-18\mathrm{.}20t^2,$ where $y$ and $t$ are expressed in feet and

seconds, respectively.

Determine when the velocity is zero. $($Round the final answer to three decimal places.$)$

The velocity is zero when t$=(?)$s$.$