7. (3 pts.) Why is it best to take measurements of the initial and final velocities right before and after the collision? Why might a velocity estimate using 20 dots be less accurate than an average using 5 dots?
8. (2 pts.) In Part 2, you were instructed to avoid rotation of the two pucks together after colliding. Why? 9. (3 pts.) What did you learn from this experiment? Did all of your results agree with your predictions, or were there any results that surprised you?
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