WAEC Physics 2025 Objective — Question 9
Question 9 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A simple pendulum of length 0.8m is set oscillating on a planet. If the pendulum completes 20 oscillations in 60s, calculate the acceleration due to gravity on this planet. [π = 3.14]
- A. 2.5 ms⁻²
- B. 3.0 ms⁻²
- C. 3.5 ms⁻²Correct
- D. 3.8 ms⁻²
Explanation
T = t/n = 60/20 = 3s. T = 2π√(L/g) → g = 4π²L/T² = 0.8/0.2279 ≈ 3.51 ms⁻² ≈ 3.5 ms⁻².
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