medium · Enhanced ACT science
A car's stopping distance was measured on a dry road at several speeds:
| Speed (km/h) | Stopping distance (m) |
| :--- | :--- |
| 20 | 5 |
| 40 | 20 |
| 60 | 45 |
| 80 | 80 |
Which relationship between speed and stopping distance does the data best show?
- Distance is directly proportional to speed, doubling whenever the speed itself doubles.
- Distance grows roughly with the square of the speed (quadruples when speed doubles).
- Distance stays essentially constant no matter how much the vehicle speed changes.
- Distance decreases as the car's speed increases, according to this option.
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