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 Homework Statement:
 Two masses m1 and m2 are at rest and joined by a spring of length l = 0.5m, as shown in the figure. There is no friction with the surface. In a given moment, an impulse with velocity v0 = 0.2m /s is given to the mass m1 only.
 Relevant Equations:

Calculate the velocity of the center of mass immediately after m1 has moved
Calculate the position of the center of mass after a time t = 4.0s
I want to know if my solution is correct:
The velocity of the center of mass immidiately after m1 has moved is just
v_{cm}=m_{1}v_{1} /(m1+m2)
I thing that i have to consider the spring and the m2
The velocity of the center of mass immidiately after m1 has moved is just
v_{cm}=m_{1}v_{1} /(m1+m2)
I thing that i have to consider the spring and the m2