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**Two masses m1=100g and m2=200g slide freely in a horizontal frictionless track and are connected by a spring whose force constant is k=.5N/m. FInd the frequency of oscillatory motion for this system.**

I don't really know how to go about this problem. I'm assuming that the equation to find the frequency would be

w^2=k/m

I did try making the center of mass, but I wasn't sure if it was even necessary. I ended up with xcom=2/3*d where d is the distance from m1 to m2.

Any help or hints would be great. I just don't feel like banging my head on the desk anymore...