Question 1034319
if you draw this and look at the vector, the hypotenuse of the triangle, the resultant, is the square root of (12^2+18^2)=sqrt (468)=21.63 ft/sec
The angle with the vertical is the tangent (18/12)=1.5
tan(-1) (1.5)=56.31 degrees, which is the angle with the vertical.  This makes intuitive sense, since the balloon is rising less quickly than it is being moved horizontally, and therefore has an angle with the vertical greater than 45 degrees.