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Ball A has a mass of 5kg and is initially moving at 3m/s, and ball B...

Ball A has a mass of 5kg and is initially moving at 3m/s, and ball B has a mass of 6kg and is traveling at -5m/s. Ball A then collides with ball B head on. After the collision, ball A is moving at -4m/s, what velocity is ball B moving at? Was this an elastic or inelastic collision?

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