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# A uniform metre rule of mass 90 g is pivoted at the 40 cm mark. If the metre rul...

### Question

A uniform metre rule of mass 90 g is pivoted at the 40 cm mark. If the metre rule is in equilibrium with an unknown mass M placed at the 10 cm mark and a 72 g mass at the 70 cm mark, then M is

A)
162 g
B)
30 g
C)
72 g
D)
102 g