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The steel balls A and B have a mass of 5...

The steel balls `A` and `B` have a mass of `500 g` each and al rotating about the vertical axis with an angular velocity of `4 rad//s` at a distance of `15 CM` from the axis. Collar `C` is now forced down until the balls are at a distance `5 CM` from the axis. How Much work must be done move the collar down?

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