A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W.

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

Correct Answer: Option D

D. 120N

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SEE ALSO  The diagram above illustrates a block and tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E.

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