which law of motion explains why you feel a force pushing you back into your seat when a car accelerates? a…

Brief Explanations:

Newton's second law states that force equals mass times acceleration ($F = ma$). When a car accelerates, the seat exerts a forward - acting force on you (to make you accelerate with the car), and according to Newton's third law, you feel a reaction force pushing you back into the seat. But the fundamental law that relates the acceleration of the car and the force you feel is Newton's second law.

Answer:

C. Newton's second law