You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.520 kg suspended from the ceiling of the bus by a string of length 1,70 m is found to hang at rest relative to the bus when the string makes and angle of 29.0 degrees with the vertical. In this position the lunch box is a distance 50.0 m from the center of curvature of the curve.
a) What is the speed of the bus.