To determine which condition the driver was most likely distracted by a mobile phone, we should look for the condition where the stopping distance is significantly longer compared to the others, indicating a delayed reaction from the driver.
Since the conditions with the same speed (70 mph) are directly comparable, we'll focus on conditions 3 and 4.
| Condition | Speed (mph) | Stopping Distance (ft) |
|-----------|-------------|------------------------|
| 1 | 30 | 75 |
| 2 | 50 | 180 |
| 3 | 70 | 315 |
| 4 | 70 | 375 |
In this case, we can see that in condition 4, where the car was traveling at 70 mph, the stopping distance is longer (375 ft) compared to condition 3 (315 ft). Therefore, it's more likely that the driver was distracted by a mobile phone in condition 4.
