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An unstable particle at rest spontaneously breaks into two fragments of unequal mass. The mass of the first fragment is 2.80 multiply.gif 10-28 kg, and that of the other is 1.56 multiply.gif 10-27 kg. If the lighter fragment has a speed of 0.894c after the breakup, what is the speed of the heavier fragment? (Assume the speeds are measured in a frame at rest with respect to the original particle.)

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