AQA A-Level Physics/Mass and energy

E=mc^2 This is the energy-mass equivalence. From this equation, we know that 1kg of mass is equal to 2.998*10^8j. Similarly, when 0.5kg of matter comes into contact with 0.5kg of antimatter, they both annihilate each other and their masses add up giving a total of 1kg of mass thus producing 2.998*10^8j. However the antimatter and matter do not just disappear into thin air, instead they are broken up to form smaller particles. This equation also tells us that when an object moves faster it has more kinetic energy and thus slightly more mass.