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A 150 g ball and a 250 g ball are connected by a 30-cm-long, massless, rigid rod. The balls rotate about their center of mass

A 150 g ball and a 250 g ball are connected by a 30-cm-long, massless, rigid rod. The balls rotate about their center of mass at 120 rpm.

What is the speed of the 100 g ball?

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