JAMB Physics 2020 Objective — Question 1
Question 1 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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1. A pendulum which has a mass of 200g is pulled sideways by a horizontal distance of 30cm. If the length of the pendulum is 50cm, calculate the potential energy of the bob in this position (g=10m/s2)
- A. A. 0.2JCorrect
- B. B. 2.0J
- C. C. 2.2J
- D. D. 20J
Explanation
h = L - sqrt(L^2-x^2) = 0.5 - sqrt(0.25-0.09) = 0.5-0.4 = 0.1m. PE = mgh = 0.2x10x0.1 = 0.2J.
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