Help with introductory Physics (I keep getting different answers)

AI Thread Summary
The discussion centers on a physics problem involving projectile motion, where a firefighter directs water at an angle of 30 degrees with an initial speed of 30 m/s from a distance of 20 m. The individual is confused by the varying answers obtained while attempting to solve the problem using vectors, with results ranging from 0 m to 20.3 m. Participants are encouraged to clarify the correct approach to solving the projectile motion equation and to identify common mistakes that could lead to different outcomes. The importance of correctly applying the equations of motion and understanding the components of vectors in projectile problems is emphasized. Accurate calculations are essential for determining the height at which the water strikes the building.
KillerNWA
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Hey guys,

Im fairly new to this, but I got this question,

"Q1.A firefighter is 20m away from a burning building. She directs the fire hose at an angle of 30 degrees above the horizontal and the water has an initial speed of 30 m/s. At what height does the water hit the building?"


I tried to solve the equation using vectors, but each time i got a different answer, the ones being 9,5,20,3 and freakishly, 0m. I am stuck beyond belief :/ Anyone know what the answer would be? even though i know it sounds stupid to ask.
 
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