We learned that if you don't know the time, you still might be able to find the final velocity.
Final Velocity w/out Time
\( \vec{v}_f~^2 = \vec{v}_i~^2 + 2~\vec{a}~ \Delta\vec{d} \)
Final Velocity w/out Time
\( \vec{v}_f~^2 = \vec{v}_i~^2 + 2~\vec{a}~ \Delta\vec{d} \)