An oceanographic research team tests two moving underwater instruments, A and B. The mass and speed of B can each be set to 1, 2 or 4 times the corresponding value for A. The team wants B to have eight times the kinetic energy of A.
Which combination of mass and speed settings for B achieves this?
Mass twice that of A and speed twice that of A
Mass twice that of A and speed four times that of A
Mass unchanged and speed four times that of A
Mass four times that of A and speed twice that of A
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.