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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 3.6 m, and the balloons are launched at a velocity of 12 m/s. acceleration= -9.8 m/s^2 . At what angle must they be launched to just graze the ceiling?
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at what height are they "launched"
the height of the ceiling is 3.6m. but i don't know the launched height
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