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a uniform metre rule of Mass 150g is pivoted at 60cm Mark.cal the mass which when hung at the 85cm Mark will balance horizontally

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no idea

Calculating moments about the piviot point:
150*10cm-M*25cm=0
M=1500/25 grams

CM=ACM
50-60=10
85-60=25
10×150=1500
1500=25
=60g

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