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# Edexcel M3 Elastic strings and springs

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1. Question
Textbook's solution
https://gyazo.com/7bb2a45cf3a9cc640ff6fd826a9c5fd3

My question: When they worked out the increased tension in Qb, shouldn't they minus the original tension which is found in the question(175N)? but instead they minus it by the modulus of elasticity of the string? Is there a mistake in the textbook?
Question
Textbook's solution
https://gyazo.com/7bb2a45cf3a9cc640ff6fd826a9c5fd3

My question: When they worked out the increased tension in Qb, shouldn't they minus the original tension which is found in the question(175N)? but instead they minus it by the modulus of elasticity of the string? Is there a mistake in the textbook?
Yep, error in book. Should be 245-175.
3. (Original post by ghostwalker)
Yep, error in book. Should be 245-175.
Thanks!

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