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A metre stick is balanced on knife edge ...

A metre stick is balanced on knife edge at its centre . When two coins, each of mass 5g are put one on top of the other at the 12.0cm mark, the stick is found to be balanced at 45.0cm. What is the mass of the metre stick ?

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Taking moments about O
`10(45-12)=W(50-45)`
`:.W=(10xx33)/(5)=66gwt`
`:.` mas of the metre stick is 66g
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