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12. Half-empty bottle

If you push a horizontally lying bottle half-full of water, it will roll forward with an oscillating speed. What does the magnitude of the oscillations in speed depend upon and how?

	Report	Opposition	Review
Australia	4.20
China			5.25
Colombia	5.20	6.80
France - ENS Lyon	8.00	7.20
Greece	6.75
Iran			6.60
Poland		6.86
Russia			7.00
Spain		6.00	4.80
Sweden		7.60	5.80
Ukraine	4.80

MEAN

5.79

6.89

5.89