2.  You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with mass 0.500 kg, suspended from the ceiling of the bus by a string 1.80 m long, is found to hang at rest relative to the bus when the string makes an angle of 30.0owith the vertical. In this position the lunch box is 50.0 m from the centre of curvature of the curve. a.  Draw the free-body diagram and kinetic diagram for the lunch box. [1 mark for each diagram] b.  What is the speed, v, of the bus?