In FIGURE CP12.88, a 200 g toy car is placed on a narrow 60-cm-diameter track with wheel grooves that keep the car going in a circle. The 1.0 kg track is free to turn on a frictionless, vertical axis. The spokes have negligible mass. After the car??s switch is turned on, it soon reaches a steady speed of 0.75 m/s relative to the track. What then is the track??s angular velocity, in rpm?

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FIGURE CP12.88