A 0.100-kilogram white ball moving with a velocity of 5 meters/second along the positive x-axis hits a stationary blue ball of the same mass. Energy is not necessarily conserved, but momentum is. After the collision, the white ball moves off at an angle of 20° with respect to the positive x-axis and at a velocity 3.5 meters/second. The blue ball moves at an angle of - 35° and a velocity of 2.1 meters/second. What is the final y-momentum of the system?
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