Why Does a Swinging Package on a Bus Indicate Its Speed?

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The discussion focuses on a physics problem involving a package suspended in a bus that is rounding a curve at a constant speed. The package, with a mass of 0.300 kg, hangs at an angle of 30 degrees from the vertical due to centrifugal force as the bus turns. The string length is 42 cm, and the package is positioned 50 m from the curve's center. Clarification is sought regarding the package's position and the meaning of "at rest relative to the bus," indicating that it does not swing back and forth but remains stationary from the bus's perspective. Understanding these dynamics is essential for calculating the bus's speed.
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As your bus rounds a flat curve at constant speed, a package with mass 0.300kg, suspended from the luggage compartment of the bus by a string 42.0cm long, is found to hang at rest relative to the bus, with the string making an angle of 30.0o with the vertical. In this position, the package is 50.0m from the center of curvature of the curve. What is the speed of the bus?

I am having a lot of trouble visualizing this. Maybe it's the description, I don't know. Correct me if I'm wrong but is the luggage dangling on the string from the top the bus?
 
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The mass is hanging down inside the bus like a pendulum - it's moving under centrifugal force as the bus corners
 
So the length of the string is 42cm long and the distance from the floor of the bus to the package is 50cm. What does it mean when it says "found to hang at rest relative to the bus"?
 

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