Increase of velocity of center of mass of a certain system

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SUMMARY

The discussion centers on the comparison of velocities V1 and V2 in a system involving a movable object and a bumper. It concludes that once the bumper loses contact with the movable object, the center of mass of that object will stop accelerating, indicating that V2 will be less than V1. This is due to the absence of external forces acting on the center of mass after the bumper disengages.

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Will the velocity V2 be greater than or less than velocity V1 in the attached sketch? Yes and why or No and why not.
 

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Once the bumper is no longer in contact with the movable object, then that object's center of mass will cease to accelerate.
 

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