A motorboat moves 30 m in the direction of a constant thrust of 400 N. The kinetic energy of the motorboat increases by 9.0 kJ. What energy is transferred to thermal stores by water resistance during this motion?
9.0 kJ9.0\ \mathrm{kJ}9.0 kJ
12 kJ12\ \mathrm{kJ}12 kJ
21 kJ21\ \mathrm{kJ}21 kJ
3.0 kJ3.0\ \mathrm{kJ}3.0 kJ
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.