Calculate the speed of a proton given its kinetic energy!! 1. The problem statement, all variables and given/known data Find the speed of a proton (mass = 1.67E-27 kg), if its kinetic energy is 145eV. Write your answer correct to three significant figures. 2. Relevant equations W=.5*m*v^2 Proton Mass = 1.67E-27 kg I tried using the same method used for the problem on this link: http://tuhsphysics.ttsd.k12.or.us/Tutorial/NewIBPS/PS17/PS17.htm#p5 3. The attempt at a solution 145 eV = 2.32315587 × 10^-17 joules W=.5 * m * v^2 2.32315587E-17 = .5 * 1.67E-27 * v^2 2.32315587E-17 / .5 / 1.67E-27 = v^2 v^2 = 27822225988 = 2.7822226E10 v = 166799.957998 = 1.66799957998E5 = 1.67E5 = 1.67E5 m/s This was my answer on the homework, but I got it wrong. What did I do wrong??