PhysicsEquilibrium of forcesJAMB
A uniform metre rule is balanced at the 40 cm mark when a mass of 20 g is hung at the 10 cm mark. The mass of the rule is:
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Answer: D. 60 g
Taking moments about the pivot: 20 × 30 = M × 10 (the rule's weight acts at 50 cm), so M = 60 g.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.