A ball of mass 20.0g collides with another ball of unknown mass at rest.?

Posted on 2017-03-23 05:30:00 in Physics by ARNOLD

The collision is elastic (kinetic energy is constant), and after impact the 20.0-g ball travels away at a 55.6o angle from its original direction, and the other ball travels away at a - 50.0o angle. What is the mass of the other ball? 

I was given the hint to "measure velocity in units of the initial velocity of the 20.0g ball." 

m1= 20.0 g 
m2=? 
v1 (initial)=? 
v2 (initial)= 0 m/s 
v1 (final)=? 
v2 (final)=? 

I am unsure what to do. The given example doesn't explain this at all. I know how to do 1D conservation momentum problems but I am struggling with 2D.

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