1. The problem statement, all variables and given/known data A bullet of mass 12.0 grams is traveling with a speed V0 and strikes a block of mass M = 1.00 kg that rests on a horizontal surface (mu = 0.40). After the bullet imbeds in the block, it slides 2.60 meters before coming to rest. The initial velocity of the bullet must have been ? m/s. 2. Relevant equations pi=pf We were told that energy was not lost to anything except friction so Ei+Wfriction=Ef 3. The attempt at a solution Ei+Wfriction=Ef (1/2)mvi2+μmgd=(1/2)mvf2 eliminated potential energy because no height is given (1/)mvi2=μmgd (1/2)(0.012kg)(vi2)=(.40)(1.012)(9.8)(2.60) vi2=1719.050667 vi=41.461 m/s Which isn't right. I think my error may lie in my assumption that the final KE is when the block has stopped and not right after impact, but I'm not certain.