A ball of mass m and another ball of mass 3m are placed
Chapter 11, Problem 11.66(choose chapter or problem)
A ball of mass m and another ball of mass 3m are placed inside a smooth metal tube with a massless spring compressed between them. When the spring is released, the heavier ball flies out of one end of the tube with speed v0. With what speed does the lighter ball emerge from the other end?
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