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Q. What is the length of second's pendulum?
Answer: 99.3 cm
Notes: Putting T = 2 sec and g = 9.8m / sec in T = 2π (l/g)1/2, we get l = 99.3 cm Hence length of second’s pendulum is 99.3 cm or nearly 1 m.

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Question Number: 18 in Physics GK 14 - Simple Harmonic Motion (SHM) in above course in App.