See the attached photo for the problem statement.
The Attempt at a Solution
The provided solution is 25 cm. I obtain about 13.4 cm, however. I am using the conservation of linear momentum and the conservation of energy (between the initial kinetic energy of the blocks and the final kinetic energy of the combined block system, along with the potential energy stored within the spring) simultaneously. Can someone verify (or disprove) my result?
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