An engineering student is testing a new electromagnetic braking system on a scale-model rail car. The car is launched at a constant initial speed along a level track, and its braking distance is recorded. Table 1 shows the results for five test runs at this speed.
Table 1
| Run | Braking distance (cm) |
|---|---|
| 1 | 18.4 |
| 2 | 19.1 |
| 3 | 34.2 |
| 4 | 18.1 |
| 5 | 18.8 |
Use the results in Table 1 to calculate the mean braking distance.
39 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.