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 ◦.
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