Introduction: In a head-on collision between a large truck and a car, we need to determine which vehicle experiences the greater momentum change. To do this, we will analyze the factors that affect momentum change in a collision.

Understanding Momentum:
- Momentum is a physical quantity that represents the motion of an object. It is defined as the product of an object's mass and its velocity.
- Momentum = mass × velocity

Factors affecting momentum change:
1. Mass: The greater the mass of an object, the greater its momentum.
2. Velocity: The greater the velocity of an object, the greater its momentum.
3. Time of collision: The longer the collision duration, the greater the change in momentum.

Analysis of the collision:
1. Collision duration: The collision lasts for 1 second.
2. In a head-on collision, the truck and car experience an equal and opposite force due to the impact. This force acts for the same duration on both vehicles.

Momentum change:
1. The momentum change of an object can be calculated using the formula: Momentum change = mass × change in velocity.
2. Since both vehicles come to a halt after the collision, the change in velocity for both vehicles is equal to their initial velocity (assuming no rebound or additional external forces).
3. The car experiences a greater change in velocity compared to the truck due to its smaller mass.

Conclusion:
In a head-on collision between a large truck and a car, the car experiences a greater momentum change. This is because the car has a smaller mass compared to the truck, and the change in velocity for both vehicles is equal. The collision duration of 1 second is the same for both vehicles, resulting in a greater change in momentum for the car.

the car