A spring in a cabinet-door mechanism stores 0.18 J of energy when its extension is 0.030 m. The spring remains in its linear range. What is the energy stored when the extension is 0.060 m?
1.44 J1.44\ \mathrm{J}1.44 J
0.045 J0.045\ \mathrm{J}0.045 J
0.72 J0.72\ \mathrm{J}0.72 J
0.36 J0.36\ \mathrm{J}0.36 J
102 exam-style questions on Edexcel GCSE Physics 15.1 Forces and springs, covering 15.1.1 Elastic and inelastic distortion, 15.1.2 The spring constant, 15.1.3 Work done in stretching a spring, and 15.1.4 Linear and non-linear force–extension. Each one has a worked solution and a mark scheme showing where the marks go.