A nucleus moving with a velocity vec(v) emits an alpha - particle. Let the velocities of the alpha - particle and the remaining nucleus be vec(v)_(1) and vec(v)_(2) and their masses be m_(1) and m_(2).

A nucleus moving with a velocity vec(v) emits an alpha - particle. Let

1.	A nucleus moving with a velocity vec(v) emits an alpha - particle. Let the velocities of the alpha - particle and the remaining nucleus be vec(v)_(1) and vec(v)_(2) and their masses be m_(1) and m_(2).
Answer» `vec(v), v_(1)` and `vec(v)_(2)` must be parallel to each other. NONE of the TWO of `vec(v), vec(v)_(1)` and `vec(v)_(2)` should be parallel to each other. `vec(v)_(1)+vec(v)_(2)` must be parallel to `vec(v)` `m_(1)vec(v)_(1)+m_(2)vec(v)_(2)` must be parallel to `vec(v)` Answer :D