A billiard ball moving to the left at 30 cm/s collides head

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A billiard ball moving to the left at 30 cm/s collides head

A billiard ball moving to the left at 30 cm/s collides head on with another billiard ball moving to the right at 19 cm/s. The masses of the balls are identical. If the collision is perfectly elastic, what is the velocity of each ball after the impact?
vf, initially at 30 cm/s =          cm/s
vf, initially at 19 cm/s =           cm/s

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