JAMB Physics 2025 Objective — Question 11
Question 11 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A uniform metre rule of weight 1 N is pivoted at 20 cm. A 0.2 kg mass hangs at 0 cm. Where should a 0.3 kg mass be hung to balance it horizontally? (g=10 ms⁻²)
- A. 23 cm markCorrect
- B. 60 cm mark
- C. 81 cm mark
- D. 36 cm mark
Explanation
Taking moments about pivot: 2×20+1×(x-20)=3×(x-20)+30 → x≈23.33 cm.
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