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How fast is her racket moving immediately after the impact?

  1. Oct 3, 2007 #1
    A tennis player swings her 1000 g racket with a speed of 10.00 . She hits a 60 g tennis ball that was approaching her at a speed of 20.0 . The ball rebounds at 40.0 .

    How fast is her racket moving immediately after the impact? You can ignore the interaction of the racket with her hand for the brief duration of the collision.

    I used the conservation of momentum equation below

    M1(Vf)1+M2(Vf)2=M1(Vi)1+M2(Vi)2

    after rearranging this for Vf1 which in this case is the final speed of the racket I get 8.8m/s.

    I should get 6.4m/s. Can someone please help me with this.
     
    Last edited: Oct 3, 2007
  2. jcsd
  3. Oct 3, 2007 #2

    Avodyne

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    Science Advisor

    You have to get the signs of the velocities right.
     
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