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In the figureIr the rock weighs 225 lb and is lifted 1 ft by the lever. (a) How much work Is done? {b} The other

In the figureIr the rock weighs 225 lb and is lifted 1 ft by the lever. (a) How much work Is done? {b} The other end of the lever l5 pushed down 3 : while lifting the rack. What force had to act on that end? Em

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