The system will vibrate a lot when the forcing

frequency is $4$ rad$/$s$.$

a$.$ Yes

b$.$ No$,$ only one mass will vibrate a lot

c$.$ No$,$ neither of the masses will vibrate much

$051015$

Time $($s$)$

$-0\mathrm{.}01$

$0$

$0\mathrm{.}01$

$0\mathrm{.}02$

$0\mathrm{.}03$

x $($m$)$

Numerical $3$rd$-$order $12$th$-$order

$1$ kg$1$ kg

$9$ N$/$m $16$ N$/$m