| compare kinetic energy. | | You might as well compare a potato gun to an assault rifle, and say they | are equally dangerous.
Actually, potato guns are pretty dangerous, with many sending a potato at over 200 feet per second.
Let's compare kinetic energies :)
A .22 rifle has muzzle velocities around 1000 fps (right around the speed of sound.) Suppose that the bullet weighs 5 grams (75 grains). KE = 231 joules.
Compare to a 150 gram potato launched at 200 fps. KE = 279 joules.
(Man, I wish we'd use the metric system already ...)
Of course, I've picked a small gun here -- an assault rifle will generally fire the bullet much faster, and I imagine the bullets are generally large as well, but either way, the difference between a potatoe gun and gun fired bullet is much smaller than the difference between a park flier and 1/4th scale plane.
Would I rather get hit with the potato or the .22 bullet? Tough call. Probably the potato, because at least there the impact is spread out. But both can kill.
Of course, even a kicked soccer ball or a baseball hit with a bat can have a large kinetic energy as well -- and can kill. But none of these, including the potato or the .22 bullet, have anywhere near the kinetic energy of a large and fast R/C airplane.