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What purpose do the two machines illustrated both serve?

Explanation

Both the incline plane (left) and the pulley (right) reduce the magnitude, or intensity, of effort required to move the load from one level up to another. The total force required is still the same, but that force is spread out over a greater distance. (In the case of the incline plane, the increase in distance is the length of the ramp in excess of the vertical distance; in the case of the pulley, the increase in distance is the extra length of the rope that the pulley requires.)

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