# Answer on Mechanics | Relativity Question for Helen

Question #52486

An unstable particle at rest breaks up into two fragments of unequal mass. The mass of the lighter fragment is equal to 2.50 x 10^-28 kg and that of the heavier fragment is 1.67 x 10^-27kg. If the lighter fragment has a speed of 0.893c after the breakup, what is the speed of the heavier fragment?

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