## University Physics with Modern Physics (14th Edition)

$7.2\times10^{19}J$.
The 400 kg of antimatter annihilates with 400 kg of matter. The energy release is now calculated. $$E =mc^2=(800kg)(3.00\times10^8 m/s)^2=7.2\times10^{19}J$$ This is approximately 72 percent of the US annual energy use.