A uniform meter stick is supported by a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where (at what markshould a third mass of 0.30 kg be hung to keep the stick in balance?"

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A uniform meter stick is supported by a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where (at what markshould a third mass of 0.30 kg be hung to keep the stick in balance?"