A spring obeys Hooke's law and has a spring constant of 200 N/m. Its extension increases from 0.030 m to 0.050 m. Use E=12kx2\displaystyle E=\frac{1}{2}kx^2E=21kx2. What additional work is done on the spring?
0.04 J0.04\ \mathrm{J}0.04 J
0.34 J0.34\ \mathrm{J}0.34 J
0.25 J0.25\ \mathrm{J}0.25 J
0.16 J0.16\ \mathrm{J}0.16 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.