The table shows estimated stopping distances for a car in fixed conditions.
| Speed in m/s\mathrm{m/s}m/s | Stopping distance in m\mathrm{m}m |
|---|---|
| 10 | 12 |
| 20 | 36 |
| 30 | 72 |
The driver’s reaction time is 0.60 s at each speed. How does the braking distance at 30 m/s compare with that at 10 m/s?
It is nine times as large.
It is three times as large.
It is six times as large.
It is twelve times as large.
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.