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

Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is of height 3.5 m, and the balloons are launched at a velocity of 11 m/s. The acceleration of gravity is 9.8 m/s. At what angle must they be launched to just graze the ceiling? Answer in units of

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