Three forces with magnitudes �" = 20 kn, �& = 30 kn, and �( = 15 kn act on a bracket a. express forces �" and �& in cartesian vector notion. b. determine the direction (�) of force �( such that the resultant force contains only a component in the y-direction (note: there are two possible angles. solve for both). c. which angle from part (a) provides a smaller magnitude of the resultant force? d. express the resultant force in cartesian vector notion using the angle from part (c).