Recommendation and Justification

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The measured value in my opinion should be fairly far from the actual strength of the string. Therefore, if I was in a real world scenario, I would probably apply a safety factor of 2 to the 2.37 N force that was calculated (which I would round to 2.5). This would give a tensile breaking strength of 5 newtons. This force would account for prolonged use of the toy as well as any variations in quality of the string itself, and provide some peace of mind that the string is twice as strong as it needs to be. Also, for legal safety (as well as real safety!), I might include 2 strings in the box and say that it is recommended that both are attached to the toy when in use. That would account for any seriously damaged strings that accidentally get put in boxes, and provide a huge amount of safety.

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