A stone falls from rest. After falling through 5.0 m, it passes point P. It then falls a further 15 m to point Q. Air resistance is negligible. What is the ratio of its speed at Q to its speed at P?
4:14:14:1
2:12:12:1
3:13:13:1
3:1\sqrt{3}:13:1
121 exam-style questions on Edexcel GCSE Physics 3.1 Energy stores and calculations, covering 3.1.1 Gravitational potential energy, 3.1.2 Kinetic energy, and 3.1.3 Energy transfers and conservation of energy. Each one has a worked solution and a mark scheme showing where the marks go.