Question

An atomic nucleus at rest decays radioactively into an alpha particle and a nucleus smaller than the original. What will be the speed of this recoiling nucleus if the speed of the alpha particle is 2.20E+05 m/s? Assume the recoiling nucleus has a mass 54 times as great as that of the alpha particle.
bobpursley
54M*V=M*2.2E5
V=2.2E5/54