1. The problem statement, all variables and given/known data In this lab we used a ballistic pendulum to find velocity. They gave us the equation (below) to find the velocity of the ball that we shot and want to know if there's another way of finding muzzle velocity. I thought of using the Conservation of Momentum/Energy formula but I'm not getting similar results. θ=25 M=4.5kg m=.7kg Rcm=.3m 2. Relevant equations v= M/m * radical(2gRcm(1-cosθ)) 3. The attempt at a solution I'm getting something like 2.5 or so while the conservation equations lead to a decimal. I figured it out. I didn't take into account the nonconservative forces.