Another amplitude and oscillation problem

[LBRRIT2390]

Homework Statement

A small earthquake starts a lamppost vibrating back and forth. The amplitude of the vibration of the top of the lamppost is 6.5 cm at the moment the quake stops, and 8.0 seconds later it is 1.8 cm.

A. What is the time constant for the damping of the oscillation? _____ seconds

B. What was the amplitude of the oscillation 4.0 s after the quake stopped? _____ cm

Homework Equations

A. ?

B. ?

The Attempt at a Solution

Don't know where to start

 

[tiny-tim]

Hi LBRRIT2390!

What is the standard equation for damped motion with time constant T?

 

[LBRRIT2390]

I honestly have no idea

 

[tiny-tim]

What do you know about damped motion, then?