PHY
posted by ami .
VECTOR A has a magnitude of 55. Ax is 26. What are the two possibilities for Ay?

well, A can point in the +x,+y direction, or +x,y direction.
The angle between A and the x axis will be
theta=arccos 26/55
and Ay= +55sinTheta 
(26)^2 + Y^2 = (55)^2
676 + Y^2 = 3025
Y^2 = 3025  676 = 2349,
Y = + 48.47.