Question: A small earthquake starts a lamppost vibrating back and forth. The amplitude of the vibration of the top of the lamppost is 6.3 cm at

A small earthquake starts a lamppost vibrating back and forth. The amplitude of the vibration of the top of the lamppost is 6.3 cm at the moment the quake stops, and 8.4s later it is 1.4 cm. _{Express with units}

a) What is the time constant for the damping of the oscillation?

b) What was the amplitude of the oscillation 4.2 s after the quake stopped?

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