How does weight affect the stopping distance of a commercial vehicle?

Answer: C — Heavier loads require a longer stopping distance

The correct choice highlights an important principle in physics related to braking and momentum. As the weight of a commercial vehicle increases, so does its momentum. According to the laws of physics, momentum is the product of mass and velocity; therefore, a heavier vehicle will have more momentum at a given speed. When it comes to stopping a heavier vehicle, greater force is required to overcome that momentum and bring the vehicle to a complete stop. This means that the heavier the load, the longer the stopping distance will be. The increased weight affects not only the distance needed to stop but also the braking system's efficiency, as more braking power is required to achieve the same stopping distance that a lighter vehicle could achieve. This concept highlights the need for drivers of commercial vehicles to account for varying weights when planning their stops, as this can significantly impact safety on the road. Understanding the relationship between weight and stopping distance is crucial for effective driving practices and accident prevention.