JAMB Physics 2009 Objective — Question 5
Question 5 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2009 Objective paper, with the correct answer and a full explanation.
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5. A force F is required to keep a 5 kg mass moving round a circle of radius 3.5 m at a speed of 7 ms⁻¹. What is the speed, if the force is tripled?
- A. 4.0 ms⁻¹
- B. 6.6 ms⁻¹
- C. 12.1 ms⁻¹Correct
- D. 21.0 ms⁻¹
Explanation
F = mv²/r, so F ∝ v². If force is tripled, v2 = √3 x v1 = √3 x 7 ≈ 12.1 ms⁻¹.
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