A 1.20-kg object (1) elastically collides with a 3.60-kg object (2) that is initially at rest. The less massive object has a speed of v1 = 4.00 m/s and travels at an angle of θ1 with its original direction after the collision; the more massive object has a speed of v2 = 1.20 m/s and travels at an angle of θ2 after the collision. What is the initial velocity of object 1?

What is the scattering angle of θ2?

What is the scattering angle of θ1?

Explanation is in the file

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