Automobile Skidding Police have used the formula to estimate the speed s (in miles per hour) of a car if it skidded d feet when stopping. The literal number f is the coefficient of friction, determined by the kind of road (such as concrete, asphalt, gravel, or tar) and whether the road is wet or dry. Some values of f are given in Table 1. At 45 mi/h, about how many feet will a car skid on a dry concrete road? Give your answer to the nearest foot.
Table 1
| Concrete | Tar |
Wet | 0.4 | 0.5 |
Dry | 0.8 | 1.0 |
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