A distinguished scientist tells you that he observed a particle that was at rest

Question

A distinguished scientist tells you that he observed a particle that was at rest decay into two different sub-particles. He claims that one of the sub-particles remained at rest, while the other one sped off with some non-zero velocity. You tell him you doubt this, because Select one: A. mass cannot be conserved in such a decay B. angular momentum cannot be conserved in such a decay C. electric charge cannot be conserved in such a decay D. energy cannot be conserved in such a decay E. linear momentum cannot be conserved in such a decay

Explanation / Answer

E. linear momentum cannot be conserved in such a decay

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