Question

make Adding metal discs to the car would increase its mass, resulting in a lower acceleration according to Newton's second law (F=ma), because the same force applied by the hanging weights would now have to overcome the increased inertia of the heavier car. Therefore, the car would accelerate more slowly compared to the trials where only the hanger was weighted down. sound like a 9th grader wrote it

Answer 1

Adding metal discs to the car would make it heavier, which means it would speed up more slowly. According to Newton's second law (F=ma), when you use the same force from the hanging weights, now the car has more mass to deal with because of the extra weight. So, it would take more effort for the car to move, and that’s why it wouldn't accelerate as fast compared to when we only added weight to the hanger.