Equilibrium: A meter stick balances at the 50.0-cm mark. If a mass of 50.0 g is placed at the 90.0-cm mark, the stick balances at the 61.3-cm mark. What is the mass of the meter stick?
A. 127 g
B. 178 g
C. 89.7 g
D. 32.6 g
E. 73.4 g
Answer: A
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