questionedithistorytranslationsCurrent version This is the accepted version. added by Paweł Kołodziejczyk Aug. 4, 2015, 12:10 p.m. What is "c" in E=mc^2? thermodynamic free energyspecific heat capacityspeed of lightCoulomb, unit of the electric chargeIn words, energy equals mass multiplied by the speed of light squared.Paweł KołodziejczykShare and bring new players to the game!0Very uninterestingToo difficultPoorly writtenIncorrect or questionableCorrect this questionwikipedia → Mass–energy equivalence0Very interesting! wikipedia → Mass–energy equivalencereach: rather globaldiscovererslightphysicsVotes Acceptable life-o-holic Acceptable BrainCharge Acceptable Ben Congry