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How do you do the math part of this question? I get the physics part of...

How do you do the math part of this question? I get the physics part of Elastic collision having momentum and kinetic energy. But can you please break the math down step by step? Especially the quadratic equation.

Calculate the velocities of two objects following an elastic Collison, given m1=0.5 kg, m2= 3.5 kg, and v1= 4m/s, and v2= 0.

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