Ball hitting the bat

A ball approaches a batsman horizontally at speed vballv_{\text{ball}}, and the batsman swings the bat, hitting the ball back along the same path. If the speed of the bat is vbatv_{\text{bat}} when it hits the ball, then what is the recoil speed of the ball?


Details and Assumptions:

  • The collision is perfectly elastic.
  • For all practical purposes, the speed of the bat is constant throughout the collision.
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