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A body of mass 120g placed at the 10cm mark on a uniform metre rule...

Physics
WAEC 2011

A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule
  • A. 60g
  • B. 80g
  • C. 120g
  • D. 200g
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Correct Answer: Option D
Explanation
m = \(\frac{25 \times 120}{15}\)

= 200g

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