A man holds a 154-N ball in his hand, with the foerarm horizontal. He can support the ball in this position because of the flexor muscle force, which is applied perpendicular to the forearm. The forearm weighs 20.3 N and has a center of gravity as indicated. I found the magnitude of the flexor muscle force to be 1052.196078 N and the magnitude to be 877.7 N but I am unsure what to put for the direction, as a positive angle counterclockwise from horizontal of the force applied by the upper arm bone to the forearm at the elbow joint. (I have also tried -877 N for C)