The table shows stopping distances measured for a car. Its reaction time is constant and its braking distance is proportional to the square of its speed.
| Speed in m/s\mathrm{m/s}m/s | Stopping distance in m\mathrm{m}m |
|---|---|
| 10 | 11 |
| 20 | 32 |
What stopping distance does this model predict at 30 m/s?
48 m48\ \mathrm{m}48 m
63 m63\ \mathrm{m}63 m
54 m54\ \mathrm{m}54 m
72 m72\ \mathrm{m}72 m
126 exam-style questions on Edexcel GCSE Physics 2.5 Stopping and braking distances, covering 2.5.1 Stopping distance and reaction time, 2.5.2 Factors affecting stopping distance, 2.5.3 Dangers of large decelerations, and 2.5.4 Braking distance and initial speed. Each one has a worked solution and a mark scheme showing where the marks go.