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## Homework Statement

A boy holds the rope so it can't move. What is the tension in point A?

## Homework Equations

ma=F

## The Attempt at a Solution

The answer in the book is 4N. I understand how to get it, but, I believe that the tension of S1 would be 9N (due to m1), and then the forces on m2 would be gravity, T

_{A}and T

_{S1}. Together, we don't get zero, but 3N. Is there a problem or am I wrong?