$($TM $3-6$; $5$ pts$)$ Two masses m$1100$ g and m$2200$ g slide freely on a horizontal frictionless

track and are connected by a spring whose force constant is k $0\mathrm{.}5$ N$/$m$.$ Find the frequency

of oscillatory motion for this system. $($Hint: in the center of mass frame, what happens to the

total extension of the spring if one mass moves left by some amount?$)$