A mass, m₁ = 3kg is initially travelling with a speed of 4 m/s, and runs into a mass m², that is initially at rest. After the collision, the mass m₁, has reversed direction, and is travelling at 2m/s.   a. What is the magnitude of the momentum of mass m₂ after the collision? b. For this part, assume mass m₂ =9kg. Is this an elastic or inelastic collision? Provide a written and mathematical argument to justify your answer.

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