Yes. The components of a vector is calculated with the angle that it makes with one of the chosen perpendicular directions, seven degrees, and the magnitude (size or length) of the vector, that is 31786 kgm/s in this case.
It is time for me to go home also. I might be online in about 16 hours time.
What you need to do is calculate the components of this vector and compare it with the momentum vectors before the collision. Since momentum is conserved the components need to be the same in both directions before and after collision.
You need to calculate the components of the momentum after the collision, [itex]p_a[/itex]. These two components are such vectors that when added together will produce the vector [itex]p_a[/itex]. They also form the sides of a right angle (its base and perpendicular) as indicated in the attachment, while the vector [itex]p_a[/itex] are the hypotenuse of the triangle.