A skier and their equipment have a total mass of 70 kg. The skier passes point P at 14 m/s and coasts uphill without pushing. At point Q, the skier is 5.0 m vertically above point P and is moving at 6.0 m/s. Some energy is transferred to thermal stores between P and Q. Use g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg.
What amount of energy is transferred to thermal stores between P and Q?
6.9 kJ6.9\ \mathrm{kJ}6.9 kJ
1.3 kJ1.3\ \mathrm{kJ}1.3 kJ
2.1 kJ2.1\ \mathrm{kJ}2.1 kJ
3.5 kJ3.5\ \mathrm{kJ}3.5 kJ
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.