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A billiard ball, initially moving to the left at 15.7 cm/s, collides head on with another...

A billiard ball, initially moving to the left at 15.7 cm/s, collides head on with another ball moving to the right at 40.8 cm/s. The masses of the balls are identical. If the collision is perfectly elastic, what is the velocity of the first ball (initially moving the left) after the impact? Give your answer in cm/s.

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