I spent about over an hr for this problem and still cant figure it out. :yuck:(adsbygoogle = window.adsbygoogle || []).push({});

expressing the kinetic energy in terms of momentum (k= 1/2^2mv=p^2/2m) prove using symbols not numbers that the fractional loss during the collision is equal to M/(m+M).

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# Need some help on kinectic energy

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