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## Homework Statement

For drawing purposes, I'm just going to state the locations of the 2 points. Cable AB carries a tension of 12 kN. Point A=(0,0,70) m and point B=(35,-25,10) m.

Find the corresponding force on point B as a vector.

okay now this part has me confused. I'm trying to find my r vector so I can get the unit vector out of that and multiply by the tension to get the corresponding force vector.

My question is do you do B-A or A-b to get the r vector? The only way I can match the signs in the book is to do A-B, but why would it be A-B instead of B-A?