A toy dart gun contains a spring with a spring constant of 400 N/m. When the gun is loaded, a force of 20 N keeps the spring compressed. The spring obeys Hooke's law. When the trigger is pressed, the spring returns to its original length and the dart is fired horizontally.
Calculate the energy transferred to the kinetic store of the dart when it is fired.
Assume that no energy is transferred to thermal stores.
106 exam-style questions on AQA GCSE Physics 5.3 Forces and elasticity, covering 5.3 Forces and elasticity. Each one has a worked solution and a mark scheme showing where the marks go.