1. The problem statement, all variables and given/known data A bullet of mass .060 kg hits a 5.000 kg block with an initial speed of 225 m/s. The block is connected to a spring. The friction between the block and the table is negligible. Upon impact the bullet bounces back from the box with a speed of 75 m/s. Calculate the speed of the block right after the collision. As a result of the collision the spring compresses to a maximum of .20 m. Find the spring constant. Find the inelastic energy lost during the collision. 2. Relevant equations F=kx 3. The attempt at a solution I solved part A by using mv = MV - mv(final) and ended with an answer of 3.6 m/s. Part b uses the equation F=kx, where x is the compression, f is force, and k is the spring constant. F=k(.20m) I also have the formula PE = 1/2Kx^2, but because PE=mgh and I have no h, I am unsure of how to solve this problem. I have no idea how to start part 3, we have not gone over inelastic collisions in class, only elastic. Any help would be greatly appreciated.