Using a movable block with a weight of 20 N, the load is evenly lifted, applying a force of 210 N to the free end of the rope. What is the weight of the load? Friction is negligible.
Since the movable block gives a 2-fold gain in strength, applying a force of 210N to the free end of the rope, you can lift a load with a total weight of 2 * 210N = 420N. Of these, 20N is the weight of the block, which means the weight of the load is 400N.
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