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Physics (AS & A Level) · Oct / Nov 2019 · Paper 12 · Question 18

9702Stress and strain

The graph shows the effect of applying a force of up to 5.0 N to a spring. The spring obeys Hooke's law for forces up to 7.0 N. What is the total extension of the spring produced by a 7.0 N force?

  1. A4.2 cm
  2. B5.6 cm
  3. C15 cm
  4. D20 cm

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Correct answer: A. 4.2 cm

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