A 5 kg ball moving with a velocity of 15 m/s at 37 degrees and a 3 lg ball moving with a velocity of 10 m/s at 60 degrees sw collide with a 4 kg ball that is at rest. After the collision the 5 kg ball moves away at 8.5 m/s at 20° south west and 3 kg ball moves at 6 m/s at 80° north east. What is the velocity of the 4 kg ball
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