Two braking tests are carried out using the same car and driver. The table shows the results.
| Test | Speed in m/s\mathrm{m/s}m/s | Thinking distance in m\mathrm{m}m | Stopping distance in m\mathrm{m}m |
|---|---|---|---|
| P | 16 | 12 | 32 |
| Q | 16 | 12 | 42 |
Which change could explain these results?
Less tyre–road friction increases the braking distance.
A longer reaction time increases the thinking distance.
More tyre–road friction increases the braking distance.
A shorter reaction time increases the thinking distance.