3. A 0. 125 kg harmonic oscillator has a total oscillation energy of 2.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?
(A) 1.4 Hz,
(B) 4.5 Hz,
(C) 3.1 Hz,
(D) 2.3 Hz,
(E) 6.4Hz.

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