A Sticky Hockey Puck Slides Along a Frictionless, Horizontal Ice

Multiple Choice

A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide perfectly inelastically. If the first puck has a mass equal to half that of the second, what is the angle of their final velocity vector below the +x direction?

A) 9.5 degrees
B) 42 degrees
C) 34 degrees
D) 49 degrees
E) 37 degrees