A 1 kg plastic ball is rolling forward at 0.61 m/s. It collides with a second plastic ball of mass 1.9 kg, also rolling forward

Question

A 1 kg plastic ball is rolling forward at 0.61 m/s. It collides with a second plastic ball of mass 1.9 kg, also rolling forward at 0.22 m/s. After the collision, both balls continue rolling at different speeds. The 1.9 kg ball is now rolling at 0.85 m/s. What is the new velocity of the 1 kg ball?

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