A geologist places a small rock on the left-hand pan of a balance. The two pans are level as shown when masses with a total weight of 23N are placed on the right-hand pan. Take the weight of 1.0kg to be 10N.
What is the mass of the small rock?

1 )
0.023kg
2.3kg
3 )
23kg
4 )
230kg
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