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On a billiards table a cue ball is initially at rest at the point O on the table. It is struck by the stick so that it leaves the stick with a center of mass speed vo and reverse spin of angular speed oo. A kinetic friction force acts on the ball as it skids initially across the table. o da e a) Explain why the balls angular momentum is conserved about the point。. b) Using the conservation of the angular momentum find the critical angular speed o such that if ,-o, the kinetic friction will bring the ball to a complete stop. c) If the 0.9 determine the balls CM velocity VeM when it starts to roll without slipping d) What happens if co= 1.1 ? Does the billiard ball return back ? 声す

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