As your bus rounds a flat curve at constant speed, a package with mass of .600 kg, suspended from the luggage compartment of the bus by a string 46 cm long, is found to hang at rest relative to the bus, with a string making an angle of 30 degrees with the vertical. In this position, the package is 55 m fromt he center of the curvature of the curve. What is the speed of the bus (m/s)?