Oh, and one more if you have the time. I have no idea where to begin with this one.
It's wanting to know the velocity of the bus.
You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.530 kg suspended from the ceiling of the bus by a string of length 1.79 m is found to hang at rest relative to the bus when the string makes an angle of 34.0º with the vertical. In this position the lunch box is a distance 54.0 m from the center of curvature of the curve.