Question

A uranium nucleus (mass 238 units) at rest decomposes into a helium nucleus (mass 4.0 units)...

A uranium nucleus (mass 238 units) at rest decomposes into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the helium core velocity is 5.5 × 105 m / s, what is the thorium core velocity?
 

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