Red is a girl of mass m who is taking a picnic lunch to her grandmother. She

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Red is a girl of mass m who 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 point A, which is a distance R/2 lower than the branch (Figure). What is the minimum breaking tension for the rope if it is not to break and drop Red into the creek?

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