Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is of height 3.

Some enterprising physics students workingon a catapult decide to have a water balloonfight in the school hallway. The ceiling is ofheight 3.7 m, and the balloons are launchedat a velocity of 11 m/s.The acceleration of gravity is 9.8 m/s2 .At what angle must they be launched tojust graze the ceiling?Answer in units of ◦.