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f 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?

  • physics -

    Use the law of conservation of linear momentum. The change in the ball's momentum, which is 0.057 kg*(72+48 m/s), is equal and opposite to the change in player's momentum.

  • physics -

    still i can't get the answer

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