A ball of mass elastically collides with a wall with velocity v then charge in momentum is equals to
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Total momentum is conserved, but it is not conditio sine qua non for linear P to be conserved. I also know that P, before collision is equal to P aftercollision, but there is a difference in sign, which makes P(initial) - P(final) = -2mu instead of zero, as the conservation law would prescribe.
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