Final answer:
Experiment 1 is the better test of how mass affects an object's motion because the student measures the distance each ball travels, allowing for a direct comparison of how mass affects the distance traveled.
Step-by-step explanation:
Experiment 1 is the better test of how mass affects an object's motion because the student measures the distance each ball travels.
In experiment 2, the ball is kicked with different forces, but this does not directly measure how mass affects an object's motion.
In experiment 1, the student uses balls with different masses, which allows for a direct comparison of how mass affects the distance traveled.
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