I just found this site, AWESOME. Im having a problem this problem dealing with vectors: An airplane has a veloctiy of 300mph going North of East, and the wind is blowing eastward at a velocity of 100mph at an angle of 45 degrees from east, what is the plane's new velocity? is V naught= to 300(cos45) ? (the new velocity?) Because using relative velocity addition is not coming up with the right answer, 300 is obviously the hypotenuse of this R triangle, I am stuck. I know the answer (360mph) I dont know how to work the problem to get the correct answer!! Help!!!