A 7 kg mass, moving at 10 m/s, is approaching a 5 kg mass, at rest. The 7 kg mass has a light spring, with a force constant of 1000 N/m, oriented towards the 5 kg mass so that when the masses meet, the spring will compress along its axis. When the masses collide, what distance does the spring compress by? Hint: this system doesn't loose energy during the collision.
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