A firefighting crew uses a water cannon that shoots water at 30.0 m/s
at a fixed angle of 47.0 ∘
above the horizontal. The firefighters want to direct the water at a blaze that is 11.0 m
above ground level.

How far from the building should they position their cannon? There are two possibilities (d1 ); can you get them both? (Hint: Start with a sketch showing the trajectory of the water.)