These tasks: h (height of lifting the load using the movable block) = 1.5 m.
Since any movable block gives a 2-fold gain in strength, but a 2-fold loss in distance, the free end of the rope had to be stretched 3 meters.
Proof: Pg * h = F * l, whence l = Pg * h / F = 2F * h / F = 2h = 2 * 1.5 = 3 m.
Answer: The free end of the rope was stretched 3 meters.
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