I wasn't converting , I used the "for comparison" on the
wiki rail gun page.

Quote:
For comparison, 50MJ is equivalent to the kinetic energy of a
school bus weighing 5 metric tons, travelling at 509 km/h (316 mph).


in other words the 50 MJ is the energy that is used to launch
a projectile from one of the US Navy rail guns.

didn't know the weight of the projectile so I used the info
that the page did supply.

its in my post.


3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.