Homework Help: physics

Posted by Kim on Friday, October 30, 2009 at 12:15am.

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 - drwls, Friday, October 30, 2009 at 2:39am
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 - Anonymous, Tuesday, November 3, 2009 at 10:24pm
still i can't get the answer

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