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An unstable particle at rest breaks up into two fragments of unequal mass. The mass of...

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

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In such case of collison, linear momentum is conserved.

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