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Two balls are about to collide. Ball 1 has a mass of 14kg, and is moving [down] at an
unknown speed. Ball 2 is 9kg and is moving [up] at a speed of 12m/s. After they
collide, ball 1 moves with a velocity of 10m/s [80° Up of right]. Ball 2 moves with an
unknown velocity [60° down of left]. An image has been added to help picture the
situation.
What is the initial velocity of ball 1?

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