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A meterstick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40...

A meterstick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 5-cm and 70-cm marks, respectively. Where should Doug hang a third mass of 0.20 kg to keep the stick balanced?

a. 90 cm

b. 20 cm

c. 80 cm

d. 50 cm

e. 10 cm

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