8.29 Four masses are positioned in the xy- plane as follows: 300 g at (x = 0, y = 2.0 %D m), 500 g at (-2.0 m, -3.0 m), 700 g at (50 cm, 30 cm), and 900 g at (-80 cm, 150 cm). Find their center of mass. Ans. x = -0.57 m, y = 0.28 m
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