The title was so encouraging (from a metric point of view). However, the rest of the article was Customary including this: "To add some perspective, one megajoule of energy is equivalent to a one ton car traveling at 100 miles per hour." (actually about 0.9 MJ; 907 kg @ 44.7 m/s). http://news.yahoo.com/u-navy-test-32-megajoule-em-railgun-coming-182407067.html;_ylt=AhyCmIBIXCwxyc2KnOOlkZbzWed_;_ylu=X3oDMTRvaGJsY3NvBGNjb2RlA2dtcHRvcDEwMDBwb29sd2lraXVwcmVzdARtaXQDTmV3cyBmb3IgeW91BHBrZwM5ZmI2NjM4Mi1iMWMyLTM5NTUtYjlkNi03N2QxOTNkMDZjZjgEcG9zAzgEc2VjA25ld3NfZm9yX3lvdQR2ZXIDMTVlNzk0NzAtNTI4Mi0xMWUxLWFmZmItYTFhNzI4MmMxMjQx;_ylg=X3oDMTJydDcyMXY0BGludGwDdXMEbGFuZwNlbi11cwRwc3RhaWQDOGRiYjFhZmEtNDZmZC0zMzgxLTg2NGEtMjJkNDkwZWFmODY3BHBzdGNhdAN1cwRwdANzdG9yeXBhZ2UEdGVzdAM-;_ylv=3 Consistent with their claimed projectile speeds, 32 MJ kinetic energy is a 13 kg projectile at 2220 m/s muzzle velocity. It is also roughly the chemical energy in 1 L of gasoline.
