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

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 0.56c and a mass of 6.68×10−27kg, while the other has a mass of 1.67×10−27kg.

What is the speed of the less massive fragment?

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