Which factor increases the braking distance?

Answer: B — Higher vehicle speed

Higher vehicle speed is a crucial factor that increases the braking distance due to the physics of motion. When a vehicle is traveling faster, it requires more time and distance to come to a complete stop. This is primarily because kinetic energy—the energy of motion—grows with the square of the velocity. Therefore, as speed increases, the kinetic energy of the vehicle increases disproportionately, necessitating a longer distance to decelerate effectively. In practical terms, when a driver applies the brakes, the force generated by the braking system works to reduce this kinetic energy. However, if the vehicle is moving at a high speed, it will still have a larger amount of kinetic energy to dissipate when coming to a stop. Consequently, this results in a substantial increase in the distance required to halt the vehicle safely. While improved tire grip and reduced weight can contribute to more effective braking, they do not offset the impact of higher speeds on braking distance in the same way. Furthermore, lower air pressure in tires could lead to decreased performance, causing longer stopping distances. All these factors highlight the critical role that speed plays in determining braking distance.