1. The problem statement, all variables and given/known data A soft clay block is suspended so as to form a so-called ballistic pendulum. A bullet is fired point-blank into the block, imbedding itself therein and raising the latter to a height h. Derive an expression for the percentage of the kinetic energy converted into internal energy during the bullet-clay impact. 2. Relevant equations Use any equation related to momentum and kinetic energy 3. The attempt at a solution I managed to get an expression: (mBvB2 - mBvC2 - mCVC2)/(mBvB2) x 100 This expression is right, but I need to simplify it to (mC)/(mC + mB) x 100. I don't know how to simplify this equation Thanks!