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A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4....
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A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the speed of the helium nucleus is 6.5 × 105 m/s, what is the speed of the thorium nucleus?
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