**Son, Don't get your math and Physics from the Argus or, busted myth busters.

The ARGUS today April 25, 2008, printed a "Reader Rant" titled "Re:Shooting Bullets". The writer gets his science from cable TV Myth Busters. He says a bullet tired into the air and then coming down to hit somebody was proven not to have "enough force" to cause serious injury. The writer also notes that a bullet returns with the "same rate as any falling object (32 feet per second squared).

Those with a little knowledge can be dangerous. Of course some of us with a little more knowledge might be even more dangerous, but here is a little physics anyway.

Velocity is distance per unit of time. Acceleration is the change in the velocity. Force on an object can be determined by the equation F=MA, or Force equals mass times acceleration. This little bit of physics and math may be about all most people ever really need to know about physics of motion.

So, the writer has confused acceleration and velocity in his comment. The velocity of falling objects in a vacuum will accelerate or increase in velocity at around 32 feet per second squared above the earth. Objects with an initial speed or velocity in an upward direction with no continuing propulsive force such as a jet engine, will accelerate in a negative direction, ie down or decelerate in more common usage.

So, if a car is pushed off a cliff about 600 feet high, using another formula distance equals initial velocity plus 1/2 acceleration times time squared, etc the car would be traveling at about 450 feet per second when it landed if there were no air resistance. Air resistance sets a "terminal velocity" for falling objects depending on the mass, density and streamlining. The falling car would be moving about 300 miles per hour if there were no air resistance. Humans falling out of an airplane don't keep accelerating until the hit the ground. Apparently terminal velocity for falling humans is about 130mph. Here is a link with some more basic information:

Physics site with question on falling bodies

Falling bullets on the other hand are a totally different can of worms to mix metaphors or something like that, but lets not get into chemistry. I do not think I would want to be the test subject for shooting even a 22 caliber rifle perfectly straight up on a windless day. Here is a link with some information on the terminal velocity of bullets, mass, etc.
"Straight Dope on Falling Bullets"target="new"

Then there is "Grandpa" who answers at Grandpa on Firing gun into the air

And finally, there is Myth Busters itself, but revisiting the falling bullet issue
Myth Busters Revisit Falling Bullets issue

Do a Google search for "Terminal velocity of a falling bullet" or body or human and you will get a lot of interesting information that somebody at the ARGUS should have checked before posting the "RANT".

So, "Be careful out there" or beware David Letterman jokes about squirrels."

***Stay tuned even if your eyes glaze over at the mere sound of the word "physics" or you think of "physic" instead and want nothing to do with loose stool..let alone falling loose nuts--- Doug Wiken