The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W

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The diagram represents a block-and-tackle pulley system on which an effort of 50N is ...

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The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W

A. 300N
B. 200N
C. 140N
D. 120N
E. 20N

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