This question was asked and answered yesterday. Just use conservation of momentum, as I explained earlier. I explained it all the way to the next-to-last step.
Our teachers will gladly show you how to do problems such as this, but not do them for you in their entirety.
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?
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