All guns can kill, but they do not kill equally. (From 2016)
Compare the damage an AR-15 and a 9mm handgun can do to the human body: “One looks like a grenade went off in there,” saysThe AR-15 is America’s most popular rifle. It has also been the weapon of choice in mass shootings from Sandy Hook to Aurora to San Bernardino. In Orlando, the shooter used a Sig Sauer MCX, an AR-15 style rifle, to kill 49 people in the Pulse nightclub. The carnage sparked new calls to reinstate a ban on assault rifles like the AR-15, which were designed as weapons of war.
It’s possible to argue about everything when it comes to the politics of guns---including about the definition of “assault rifle” itself---but it’s harder to argue about physics. So let's consider the physics of an AR-15. A bullet with more energy can do more damage. Its total kinetic energy is equal to one-half the mass of the bullet times its velocity squared. The bullet from a handgun is---as absurd as it may sound---slow compared to that from an AR-15. It can be stopped by the thick bone of the upper leg. It might pass through the body, only to become lodged in skin, which is surprisingly elastic.
The bullet from an AR-15 does an entirely different kind of violence to the human body. It’s relatively small, but it leaves the muzzle at three times the speed of a handgun bullet. It has so much energy that it can disintegrate three inches of leg bone. “It would just turn it to dust,” says, a trauma surgeon at University of Texas Health Science Center at San Antonio. If it hits the liver, “the liver looks like a jello mold that’s been dropped on the floor.
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