Question $)=(25$ : Consider the following spring$-$mass$-$damper system with $m=100kg,$ c

$=1,000N\frac{s}{m},k=30,000\frac{N}{m}.$ The mass is initially at rest and in equilibrium.

$($a$)$ Compute the amplitude and phase of the steady$-$state displacement if the mass is excited

by a harmonic force of $80$ N at $3$ Hz $.$