Hello, I've been stuck on this problem and would really appreciate if someone could help me: A block of mass MB = 4.75 kg is initially at rest on a level rough surface for which the coefficient of kinetic friction is given by uk = 0.455 . Two bullets of equal mass Mb = 0.023 kg are moving horizontally in opposite directions with speeds related by v1 = (2 / 3)v2 = 324 m / s when they collide with the block simultaneously and become embedded in the block, as represented in the image below. Do the following: a) Calculate the speed of the block just after the collision. You may assume the conservation of mass during the collision. http://i44.tinypic.com/6riz3c.jpg can someone please explain how to solve this in step by step detail? Or at least how to find the equation for the velocity just after collision?