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A 15 g mass is oscillating on a spring with spring constant of 50 N/m. (a)...

A 15 g mass is oscillating on a spring with spring constant of 50 N/m.
(a) What is the frequency of the mass on the spring?
        in Hz
(b) If the time constant is 0.4 s, how long does the oscillator take for the amplitude to decrease by 50%?
          in seconds

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