An atomic nucleus initially at rest in a reactor core collides with another nuclear particle whose..

An minute kernel moderately at quiet in a reactor core collides delay another nuclear bit whose moderate fleetness is 10,000 m/s. After normal one conflict, the nuclear bit comes to a exhaustive seal, and the minute kernel heads off in the identical bearing delay the identical average velocity. What can we infer environing the magnitude of the minute kernel in this case? If the incoming bit is an alpha bit, what part did the alpha bit lower delay?