I'm working on a small design project and need some help remember what equations to use here. Basically, we are creating a hammering device. A compression spring will be loaded, and a block on the end is accelerated into another block. I need to have it hit with a certain impact force so I am designing the spring to match this. I know the force of the spring: F=k(dx) And total energy equation: TE=.5*k(dx)^2 But I'm not really sure where to go from there since the spring will be accelerating the mass as it uncompresses.