Damped oscillations - Finding damping coefficient

[diffusion]

Homework Statement

A 50.0g hard-boiled egg moves on the end of a spring with force constant k = 25.0 N/m. It is released with an amplitude 0.300m. A damping force Fx = -bv acts on the egg. After it oscillates for 5.00s, the amplitude of the motion has decreased to 0.100m.
Calculate the magnitude of the damping coefficient b.

Homework Equations

The Attempt at a Solution

I honestly have no idea how to approach this question. Could someone steer me in the right direction?

 

[diffusion]

Anyone?

 

[Redbelly98]

Homework Equations

Note that the amplitude, at time t, is given by

Amplitude = A e^-bt/2m
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