A Uniform 12-Inch Ruler Has a 5-G Mass at the "1-Inch

Multiple Choice

A uniform 12-inch ruler has a 5-g mass at the "1-inch" mark, and a 10-g mass at the "7-inch" mark. Where is the system's center of mass?

A) At the "0-inch" mark
B) Between the "1-inch" mark and the "6-inch" mark
C) Between the "6-inch" mark and the "10-inch" mark
D) At the "6-inch" mark
E) At the "12-inch" mark