A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron

Question:

A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of 9.6 × 10-23 kg · m/s and 6.2 × 10-23 kg · m/s, respectively.
Determine the magnitude and the direction of the momentum of the second (recoiling) nucleus.