Maria must cut down a tree. To prevent the tree from falling on the neighbor's house, tie she fastens a rope to the tree and asks Nils to pull as hard as he can. If she ties fixed the rope 1.5 m above where she saws, Nils just manages to get the tree the right way if he pulls with the force 500 N. How much force must he pull with if the rope instead fastened 1.0 m above where she saws? Suppose Nils holds the rope so that it is horizontal in both cases.

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