1. The problem statement, all variables and given/known data A 7.00 g bullet, when fired from a gun into a 1.00 kg block of wood held in a vise, penetrates the block to a depth of 7.60 cm. This block of wood is next placed on a frictionless horizontal surface, and a second 7.00 g bullet is fired from the gun into the block. To what depth will the bullet penetrate the block in this case? 2. Relevant equations m1v1 + m2v2 = (m1+m2)vf 3. The attempt at a solution I have no clue how to solve this problem. I don't really know what to do with the depth of penetration by the bullet. Can anyone please help?