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A comment on Navy Sets World Record With Rail Gun. Parent comment

Re:Navy Sets World Record With Rail Gun by aidenn0 on Friday December 10, 2010 @07:45PM (#1993786)
I got ~10kg from the 2500m/s number, and under 12kg from the Mach 7 number. Google agrees:

http://www.google.com/search?q=2*33megajoules/(2500+m/s)^2+i...

http://www.google.com/search?q=2*33megajoules/(7+*+speed+of+...

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