Two masses m1=100g and m2=200g slide freely in a horizontal frictionless track and are connected by a spring whoser force constant is k=.5 N/m. Find the frequency of oscillatory motion for this system. Could someone give me a hint/help me get started on this? What equation(s) should I use??? I know omega = sqrt (k/m). I haven't done any problems like this since introductory physics 3+ years ago, so any help would be greatly appreciated!