The more momentum a vehicle has, the harder it is to?

The correct answer is stopping a vehicle. Momentum is the product of an object's mass and its velocity. Therefore, the greater the mass and speed of a vehicle, the more momentum it carries. When a vehicle has high momentum, it requires a larger force to change its state of motion, specifically to reduce its speed or bring it to a stop.

This means that the braking system of the vehicle must work significantly harder to overcome that momentum, making stop distances longer and more challenging, especially in emergency situations where rapid deceleration is required. As a result, understanding momentum is crucial for safe driving, as it emphasizes the importance of maintaining appropriate speeds and following distances to allow for effective stopping when needed.

In contrast, while the other options pertain to vehicle handling in various situations, they do not have the same direct and critical relationship to momentum as stopping does. For example, turning might be affected by high speeds, but it is primarily governed by the vehicle's handling characteristics rather than momentum alone.