Final answer:
When a car comes to a stop, the passengers lurch forward due to inertia, which is explained by Newton's 1st law of motion.
Step-by-step explanation:
According to Newton's 1st law of motion, an object in motion tends to stay in motion unless acted upon by an external force. In this case, when the car comes to a stop, the passengers inside the car continue moving forward due to inertia, which is the tendency of an object to resist changes in its state of motion. This explains why the passengers lurch forward.
Newton's 1st law of motion can be summarized as 'an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.'
Therefore, the correct answer is a. 1st law of motion.
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