Xiao Bing found that there are often speed limit warning signs in expressway as shown in Figure A. He asked his father: Why are cars driving on the same road different?

(2) The initial speed of the car moving on the horizontal plane is the same.

(3)? > mass, inertia, under the same conditions, the car needs to stop for a long distance.

Test analysis: This experiment is to explore whether the big car stops longer than the small car under the same circumstances. Therefore, it is necessary to keep the same speed, the same contact surface roughness and different mass; So the purpose of adding hook code to the car is to change the quality of the car; The purpose of letting the car slide down from the same height is that the initial speed of the car moving on the horizontal plane is the same; Because of its great mass and inertia, it takes a long distance for a car to stop under the same conditions.

Comments: The key to solve this problem is to know that the purpose of letting the car slide from the same height is that the initial speed of the car moving on the horizontal plane is the same.