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A 2.0kg ball, initially moving to the right at a speed of 3m/s, collides head-on with...

A 2.0kg ball, initially moving to the right at a speed of 3m/s, collides head-on with another ball of mass 3.0kg, initially moving to the left at 4m/s. The collision was elastic. Find the velocities of both balls after the collision.

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