Stopping distance = (Speed^2) / (2 * Braking coefficient)
where:
Speed is in miles per hour (mph)
Braking coefficient is a measure of the effectiveness of the brakes and the road surface
Assuming a braking coefficient of 0.7 (typical for dry asphalt), and a speed of 30 mph (44 feet per second), we can calculate the stopping distance as follows:
Stopping distance = (44^2) / (2 * 0.7) = 1232 / 1.4 = 880 feet
Therefore, at a speed of 30 mph, it would take approximately 880 feet (268 meters) to stop the car.
However, it's important to note that this calculation does not account for reaction time, which can add additional distance to the stopping distance. Always maintain a safe following distance and be prepared to react to sudden changes in traffic conditions.