A hydrogen atom (particle 1) is initially at rest. A neutron (particle 2) initially moves to the east at speed v, colliding with the hydrogen atom. Immediately after the collision, the neutron is moving to the south, and the hydrogen atom is moving at an angle ? north of east. The mass of the hydrogen atom is twice the mass of the neutron. Determine the particles’ final speeds, v1 and v2, in terms of v and/or ? only.