Final answer:
In a head-on collision between a Mack truck and a Volkswagen traveling at the same speed, the vehicle that undergoes the greatest change in velocity will be the Volkswagen.
Step-by-step explanation:
In a head-on collision between a Mack truck and a Volkswagen traveling at the same speed, the vehicle that undergoes the greatest change in velocity will be the Volkswagen.
This is because the change in velocity is directly related to the mass of an object. According to Newton's second law of motion, the force exerted on an object is equal to the mass of the object multiplied by the acceleration it experiences.
Since the Mack truck has a greater mass than the Volkswagen, it would require a greater force to change its velocity compared to the smaller Volkswagen.