hard · 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 (doubles when speed doubles).
- Distance grows roughly with the square of the speed (quadruples when speed doubles).
- Distance is constant regardless of speed.
- Distance decreases as speed increases.
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