physics
posted by aaron .
Two 72.0 kg hockey players skating at 5.25 m/s collide and stick together.
If the angle between their initial directions was 125 degrees, what is their speed after the collision?

Apply the law of conservation of linear momentum. Since they both have the same initial momentum magnitude, apply the law along the angle that bisects the velocity vector. That will be their final direction after collision.
2 M Vo cos (125/2) = 2 M *Vfinal
Vfinal = Vo cos 62.5 = 0.4617 Vo = ___