A utility vehicle travels on the same road at two different speeds. The driver’s reaction time is 0.70 s in both cases. The braking distances are shown in the table.
| Speed (m/s\text{m/s}m/s) | Braking distance (m\text{m}m) |
|---|---|
| 12 | 12 |
| 24 | 48 |
Calculate the stopping distance when the utility vehicle is travelling at 12 m/s.
Calculate the ratio of the stopping distance at 24 m/s to the stopping distance at 12 m/s.
Explain why the stopping distance at 24 m/s is not four times the stopping distance at 12 m/s.
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.