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Grady,
Could not be better advice (but you knew that). My only add is for others to take into account the amount of TIME represented in your post.
My son just finished 2nd in the local Science Fair and gets to move on. His project was the difference in both velocity and impact between regular paint balls and fozen paint balls.
Since my wife is a science geek (has been a judge), we followed your premise. What we did not account for were the ambiguities in the experiment and the need to re-test/shoot.
Time.
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1996 FJ80.
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