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A 100 g ball collides elastically with a 300 g ball that is at rest. If the 100 g ball was traveling in the positive

A 100 g ball collides elastically with a 300 g ball that is at rest. If the 100 g ball was traveling in the positive x-direction at 5 m/s before the collision, what are the velocities of the two balls after the collision?

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