I am brand new to this website so I hope somebody can help. I have a homework problem that goes like this: A girl of mass M is taking a picnic lunch to her grandmother. She ties a rope of length R to a tree branch over a creek and starts to swing from rest at a point that is a distance R/2 lower that the branch. What is the minimum breaking tension for the rope if it is not to break and drop the girl into the creek? I do not even know where to begin in this problem. My text book does not mention minimum breaking tension at all. If anybody knows a formula to use I would really appreciate it. Thanks.