A ball is released from rest at a height of 2.0 m above a floor. After bouncing, it rises to 1.28 m. Air resistance is negligible. What is the ratio of its speed immediately after impact to its speed immediately before impact?
0.64:10.64:10.64:1
0.80:10.80:10.80:1
1.25:11.25:11.25:1
1.56:11.56:11.56:1
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.