OK, so I manipulated the e=mc^2+pc eqaution to find that m=√(E^2-(pc)^2)/c^2, would this tell me what the relativistic mass is? I substituted e for mc^2+pc, and plugged 5kg in for mass, and .95c for v, and came out with an m value of 8.51kg, would this be right, or am I thinking of this...