The table shows stopping distances measured for a car. Its reaction time is constant and its braking distance is proportional to the square of its speed.
| Speed in m/s\mathrm{m/s}m/s | Stopping distance in m\mathrm{m}m |
|---|---|
| 10 | 11 |
| 20 | 32 |
What stopping distance does this model predict at 30 m/s?
48 m48\ \mathrm{m}48 m
63 m63\ \mathrm{m}63 m
54 m54\ \mathrm{m}54 m
72 m72\ \mathrm{m}72 m