Rod AB has a mass of 3 kg and is attached at A to a 5-kg cart C. Knowing that the system is released from rest when θ = 30° and neglecting friction, use computational software to determine the velocity of the cart and the velocity of end B of the rod for values of θ from +30° to -90°. Determine the value of u for which the velocity of the cart to the left is maximum and the corresponding value of the velocity.