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March 1, 2015

Posted by **Rebecca** on Tuesday, November 15, 2011 at 11:26pm.

- physics -
**WyzAnt**, Tuesday, November 15, 2011 at 11:35pmFind kinetic energy before, aka 1/2(mass of bullet)(velocity)^2. Then find the kinetic energy afterwards, which is 1/2(mass of bullet)(velocity afterwards)^2 + 1/2(mass of block)(whatever you got for part a)^2. Then divide whatever you got for the second part, divide it by the first part, and subtract the resulting decimal from 1 to find the percentage that was lost.

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