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m Mark for Review A toolbox is set on a rigid board that has negligible mass compared to the box. The frontmost part of the toolbox is Point A and the backmost part of the toolbox is Point B. The board is set on a pivot that is located midway between points A and B and is held in place, as shown in the left figure. When the board is released, Point A lowers and Point B rises, as show in the right figure. Which of the following must be true about the toolbox? @ The part of the toolbox to the left of the dashed line has more mass than the part of the toolbox to the right of the dashed line. The part of the toolbox to the right of the dashed line has more mass than the part of the toolbox to the left of the dashed line. [@ The center of mass of the toolbox is to the left of the dashed line. [@ The center of mass of the toolbox is to the right of the dashed line