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In the reference frame K two particles t...

In the reference frame K two particles travel along the x axis, one of mass `m_1` with velocity `v_1`, and the other of mass `m_2` with velocity `v_2`. Find:
(a) the velocity V of the reference frame `K^'` in which the cumulative kinetic energy of these particles is minimum,
(b) the cumulative kinetic energy of these particles in the `K^'` frame.

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