In a nuclear reactor, a neutron moving at speed vi in the positive x-direction strikes a deuteron,

Question:

In a nuclear reactor, a neutron moving at speed vi in the positive x-direction strikes a deuteron, which is at rest. The neutron is deflected by 90.0° and moves off with speed vi / √3̅ in the positive y-direction. Find the x-and y -components of the deuteron's velocity after the collision. (The mass of the deuteron is twice the mass of the neutron.)