A physics student is modelling the motion of a car cruising on a UK motorway at the maximum legal national speed limit. Which of the following is the most reasonable estimate for the speed of this car?
3.0 m s−13.0\text{ m s}^{-1}3.0 m s−1
13 m s−113\text{ m s}^{-1}13 m s−1
31 m s−131\text{ m s}^{-1}31 m s−1
70 m s−170\text{ m s}^{-1}70 m s−1
50 exam-style questions on OCR GCSE Physics Motion. Each one has a worked solution and a mark scheme showing where the marks go.