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Ball 1 has mass mand is moving to the right at v0= 7.50 m/s. It collides...

Ball 1 has mass mand is moving to the right at v0= 7.50 m/s. It collides with ball two, of mass 3m, which is at rest. After the collision ball 1 has a velocity of v1= 4.50 m/s at an angle of =30.0°relative to its original direction. Determine the magnitude and direction of the velocity, v2, of ball 2 after the collision. The correct answer is Vf=1.42m/s and theta= -32.0. How do I find these answers?

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