The small car, which has a mass of 20 kg, rolls freely on the horizontal track and carries the 5-kg sphere mounted on the light rotating rod with r = 0.4 m. A geared motor drive maintains a constant angular speed θ˙ = 4 rad /s of the rod. If the car has a velocity v = 0.6 m /s when θ = 0, calculate v when θ = 60°. Neglect the mass of the wheels and any friction.

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