Hmm
A few calculations show that if the projectile (which would weigh about 0.5kg) was lauched with enough force for the gun to hit the wall of the pool (it would have to travel at roughly 90mph, and even then it would hit the very bottom of the wall), it would have been accelerated to at least 550mph in 2 metres, with a force of roughly 10,000N.


In order for the gun to embed itself higher in the wall than ground level, the projectile would have to break the sound barrier by a fair bit.


(Calculations made on the assumption that the railgun weighed 25kg and a workmate is roughly 80cm high).
( MatJ LOOK, Wed 18 Feb 2009, 17:56, Reply)