The small car that 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 ω = 4 [rad/s] of the rod. If the car has a speed |v| = 0.6 [m/s] when θ = 0, calculate |v| when θ = 60◦ . Neglect the mass of the wheels and any friction.