Hey guys, I need help on some physics problems again. A 15g bullet strikes and becomes embedded in a 1.10kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.25, and the impact drives the block a distance of 9.5m before it comes to rest, what was the muzzle speed of the bullet. A gun is fired vertically into a 1.4kg block of wood at rest directly above it. If bullet has mass of 21g and speed of 310m/s, how high will the block rise into the air before the bullet becomes embedded in it? Please give me hints on how to solve these two problems.