What force will the boy need to pull on the rope to lift the weight?


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Correct Answer: C. 25 N
This is a ‘Double Block tackle’ and as there are four ropes lifting the 10 kg (100 N weight), each has a tension of 100/4 = 25 N.
The only catch is he needs to pull through four times the rope than would be required to simply lift the weight.
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