1. The problem statement, all variables and given/known data Find the delta x of the bow pullback. The weight of the pullback is 45 kg, the speed of the arrow as it shot out was 184mph( i converted that to velocity and got 83 m/s). 2. Relevant equations I'm using K1+U1+W=K2+U2. 3. The attempt at a solution I wasn't sure which formulas to plug into that equation... is it u1+work=k2? or work=k2. Then i didn't know what plugs into u1. work=FxD. please just show me where to start!