Problem: In a rest frame, a mass m1 moves with a speed of 0.2c towards a mass m2, at rest. In the center-of-mass frame, both mass move towards each other with the same speed. What must the speed of the center-of-mass frame be, relative to the rest frame, in order to achieve this?

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In a rest frame, a mass m1 moves with a speed of 0.2c towards a mass m2, at rest. In the center-of-mass frame, both mass move towards each other with the same speed. What must the speed of the center-of-mass frame be, relative to the rest frame, in order to achieve this?

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