Regarding firearm ammunition in the US, which of the following is true?
A. Fully-jacketed rounds are the preferred munition of standard US law enforcement officers B. The kinetic energy of a projectile is determined more by its given velocity rather than by its overall mass C. The term "magnum", when applied to a firearm round, implies a larger caliber or diameter as compared to a standard "non-magnum" round D. Handgun barrels are designed to impart a spin on the projectile as it exits the muzzle
The kinetic energy of a projectile is determined more by its given velocity rather than by its overall mass-kinetic energy is proportional to the mass of an object multiplied by its velocity squared (ke = 1/2 mv^2), and therefore velocity is the key component to determining the ke of a given projectile. standard law enforcement officers use hollow-point rounds to limit any collateral damage to non-combatants. the term magnum refers to rounds that have larger casings and thereby contain more gunpowder which in turn imparts a greater velocity to the projectile. rifle barrels and not handguns are designed to impart a spin on the bullet as it exits to muzzle to improve its stability in flight and overall accuracy. (rosens 954-959)