Damped oscillations

A pendulum with time period of 1s is losing energy due to damping. At certain time its energy is 45 J 45 \text { J} . If after completing 15 oscillations, its energy has become 15 J 15\text{ J} , its damping constant (in s 1 s^{-1} ) is:

2 2 1 2 \dfrac{1}{2} None of these choices 1 30 ln 3 \dfrac{1}{30} \ln 3 1 15 ln 3 \dfrac{1}{15} \ln 3

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