Physics

Particle 1 of mass 3m initially moving with a speed v0 in the positive x-direction collides with particle 2 of mass m moving in the opposite direction with an unknown speed v.After collision,particle 1 moves along the negative y-direction with speed v0/2 and particle 2 moves with a speed v' in a direction making an angle of 45 deg with the positive x-direction.Determine v and v' in units of v0.Is the collision elastic?

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