The table shows results for two cars approaching the same stationary obstacle.
| Car | Speed in m/s\mathrm{m/s}m/s | Reaction time in s\mathrm{s}s | Braking distance in m\mathrm{m}m |
|---|---|---|---|
| P | 20 | 0.60 | 30 |
| Q | 15 | 0.80 | 24 |
Both drivers first see the obstacle when it is 40 m ahead. Which statement is correct?
P stops before the obstacle; Q reaches the obstacle.
P and Q both stop before reaching the obstacle.
P and Q both reach the obstacle before stopping.
P reaches the obstacle; Q stops before the obstacle.
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.