An unstable particle is at rest and suddenly decays into two fragments. No external forces act on

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An unstable particle is at rest and suddenly decays into two fragments. No external forces act on the particle or its fragments. One of the fragments has a speed of 0.60c and a mass of 6.68 × 10-27 kg while the other has a mass of 1.67 × 10-27 kg. What is the speed of the less massive fragment?
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