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When ball 1 hits ball 2, they both go off at different angles. What is the final velocity of the second ball?

GIVEN:

ball 1=4 kg

ball 2= 10 kg

Vo1=8 m/s

Vf1=3 m/s

Vo2=0

θ=34 ° (ball 2 moves at a speed of 3 m/s @ 34°)

Solve for Vf2 and the angle for ball 2 after the collision (Angle β)

Relevant equations:

m1vo1 + m2vo2 = m1vf1 + m2vf2

i did (4)(8) + 0 = (10)(vf2)

i had no clue if this was right though. are you supposed to use sin, cos, or tan θ?