If a 57.0 g tennis ball is traveling horizontally at 72.0 m/s (which does occur), and a 55.0 kg tennis

If a 57.0 g tennis ball is traveling horizontally at 72.0 m/s (which does occur), and a 55.0 kg tennis player leaps vertically upward and hits the ball, causing it to travel at 48.0 m/s in the reverse direction, how fast will her center of mass be moving horizontally just after hitting the ball

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