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.