1. The problem statement, all variables and given/known data A projectile of mass m moves to the right with a speed vi. The projectile strikes and sticks to the end of a stationary rod of mass M, of length d, that is pivoted about a frictionless axle through its center. (a) Find the angular speed of the system right after the collision. (Use v_i for vi, m, M, and d as appropriate in your equation.) (b) Determine the fractional loss in mechanical energy due to the collision. (Use v_i for vi, m, M, and d as appropriate in your equation.) 2. Relevant equations If[tex]\omega[/tex]f=Ii[tex]\omega[/tex]i W= K1-K2 3. The attempt at a solution http://qaboard.cramster.com/Answer-Board/Image/2007111219463329548144409250092.jpg [Broken] i did it like this but for some reason my part (b) is saying that I'm wrong. Can someone help?