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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 3.

Some enterprising physics students working
on a catapult decide to have a water balloon
fight in the school hallway.The ceiling is of
height 3.7 m, and the balloons are launched
at a velocity of 11 m/s.
The acceleration of gravity is 9.8 m/s2 .
At what angle must they be launched to
just graze the ceiling?
Answer in units of ◦.
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