Momentum and Impulse Problem #2 - Radioactive Decay of Polonium-214

The nucleus of 214 Po decays radioactively by emitting an alpha particle (mass 6.65 * 10^−27 kg) with kinetic energy 1.23 * 10^−12 J, as measured in the laboratory reference frame. Assuming that the Po was initially at rest in this frame, find the recoil velocity of the nucleus that remains after the decay.