The small car, which has a mass of 20 kg, rolls freely on the horizontal track and carri...

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 = 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.