What is the length of a second’s pendulum?
Correct answer C. 99.2 cm
Explanation
A second's pendulum has a period of 2 s. From T = 2π√(l/g), l = gT²/4π² = 9.8 × 4 ÷ 39.48 ≈ 0.992 m, about 99.2 cm.
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