How fast is her racket moving immediately after the impact?

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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.
 
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