a uniform metre rule balance on a knife edge at the 55cm mark, when a mass of 40g is hung from the 95cm marks, find its weight of the ruler.
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3. X(55-50)=40(95-55)
.......5X=40 x 40
.........X=1600/5
..........X=320g
.......5X=40 x 40
.........X=1600/5
..........X=320g
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