posted by David .
Some enterprising physics students working
on a catapult decide to have a water balloon
fight in the school hallway. The ceiling is of
height 3.2 m, and the balloons are launched
at a velocity of 12 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 .