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Question:

Which of the following is the best example of Newton’s first law of motion?

A A book in a car moves forward and slides off the seat as the car quickly stops.
Explaination

Newton’s first law of motion states that an object in motion stays in motion. The example says there’s a book on the seat of a car, and as the car quickly stops, the book flies forward and slides off the seat. The book was in motion because the car was in motion, so when the car stops, the book continues to move in the direction it was moving. Answer A car accelerates as it goes down a hill is an example of a velocity question.
Salt on a road helps the car gain friction and move forward and You push a car forward on the road after it runs out of gas are both examples of Newton’s third law.