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Modelling collisions - class-XII

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Multiple Choice

When a ball collides head-on and elastically with an identical ball on a horizontal frictionless surface,comes to rest while the second one moves with the same velocity as that of the first ball before coillision . 

  1. Can be derived by using momentum conservation alone.
  2. Can be derived by using energy conservation alone
  3. cannot be derived by using any to the two conservation principles.
  4. Can be derived by using both conservation of energy and momentum
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