In example 12.2 (p. 298), suppose you wanted to calculate the center of mass of the rod using equation 12.5. what coordinate system must you use for your calculation? group of answer choices a coordinate system that has an origin located at the left end of the rod. this calculation is independent of the coordinate system you choose. a coordinate system that has an origin located at the middle of the rod. a coordinate system that has an origin located at the right end of the rod.