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## Homework Statement

Some enterprising physics students working

on a catapult decide to have a water balloon

ﬁght in the school hallway. The ceiling is of

height 3.3 m, and the balloons are launched

at a velocity of 9.7 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 ◦

## Homework Equations

Im not quiet sure which equation to use, all of projectile motion is really tough for me.