A deuteron (nucleus of deuterium atom consisting of a proton and a neutron) with speed 14.9 km/s

Question:

A deuteron (nucleus of deuterium atom consisting of a proton and a neutron) with speed 14.9 km/s collides elastically with a neutron at rest. Use the approximation that the deuteron is twice the mass of the neutron.
(a) If the deuteron is scattered through a LAB angle ψ = 10o, what are the final speeds of the deuteron and neutron?
(b) What is the LAB scattering angle of the neutron?
(c) What is the maximum possible scattering angle of the deuteron?