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AB is a long frictionless horizontal sur...

AB is a long frictionless horizontal surface. One end of an ideal spring of spring constant K is attached to a block of mass m, which is being moved left with constant velocity v, and the another end is free. Another block of mass 2m is given a velocity 3v towards the spring. Magnitude of work done by external agent in moving m with constant velocity v in long time is `beta` times `mv^(2)` . Find the value of `beta`

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