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Fifteen revolutions equal fifteen circumferences, so the circumference is 3.5m/15, or about 0.233m. Since the circumference is pi times diameter, divide 0.233 by pi and you get about 0.074m, or 74mm. (Most books would require you to limit the answer to significant figures, which would round to about 70mm.)

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Q: A child rolls a ball on a level floor three and a half meters to another child and the ball makes fifteen revolutions what is the diameter?
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