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Q.

A meter stick is balanced on a knife edge at its center.  When a coin of mass 10g is  placed at 12 cm division , the stick is found to be balanced at 45 cm division. The mass of the stick is 

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a

66g

b

33g

c

55g

d

45g

answer is A.

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Detailed Solution

m1gr1=m2gr2 

10(50-12) = m(50-45)

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A meter stick is balanced on a knife edge at its center.  When a coin of mass 10g is  placed at 12 cm division , the stick is found to be balanced at 45 cm division. The mass of the stick is