Question: Varun is skating on a rink towards the left. The ice is considered a frictionless surface. Varun has a speed of v and collides

Varun is skating on a rink towards the left. The ice is considered a frictionless surface. Varun has a speed of v and collides head-on with Korosh. In the collision they stick together. If Korosh has twice Varun's mass but half his speed moving fro the right, what is their combined speed after the collision? (*Note: Varun and Korosh's teacher does not actually know their mass)
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