Has anyone ever heard this about falling objects?

They accelerate at a 9.8 meters a second, fast enough for a bullet fired straight up to come through your roof and through your head, too.

Update:

Who's that girl down there callin "creepy"?

13 Answers

Relevance
  • 1 decade ago
    Favorite Answer

    32 feet per second per second. But air resistance is defeats most of that speed.

    • Login to reply the answers
  • 1 decade ago

    Ummmmm right.

    A bullet fired straight up will come to a halt, and begin to accelerate downward. Were it not for air, they would accelerate with enough energy to penetrate a roof and a head.

    The truth though is that bullets, after stopping, begin to tumble downward, and encounter resistance from the air, reaching what is called "terminal velocity". Terminal, in this sense does not mean "deadly", but it is merely the velocity at which acceleration by gravity is cancelled by resistance from the air. Basically, with a bullet, this is a couple of hundred feet per second. Though it sounds fast, it will not impart enough energy to cause serious damage to a human, let alone a roof.

    There have been incidents reported where a bullet fired into the air has killed individuals, but in these cases, it was not straight up, and the bullet was still acting balistically, carrying energy and rotation from the rifled barrel.

    To add perspective, a bullet fired from a rifle barrel can reach velocities of greater than 3000 feet per second. This is much faster than the terminal velocity of say 2-300 feet per second.

    By the way... why is this in R&S?

    • Login to reply the answers
  • Anonymous
    1 decade ago

    Falling from where?

    Mythbusters did a show on something similar. There is something called terminal velocity that will prevent things from falling to fast (objects from outerspace however have momentum behind them). Even a penny dropped from the Empire State Building will cause a headache (and perhaps require a couple of stitches), but it will not kill you.

    A bullet fired into the air, will again give you a headache, but not kill.

    • Login to reply the answers
  • eri
    Lv 7
    1 decade ago

    Yes, but there's a great deal of air friction to compete with. Experiments have shown that they don't accelerate as much on the way down as they did when shot out the first time.

    Source(s): I'm a physicist.
    • Login to reply the answers
  • How do you think about the answers? You can sign in to vote the answer.
  • 1 decade ago

    No. That's not taking into account air resistance, which can pretty much makes a light, partially melted bullet about as effective at piercing hard objects as you throwing it with your hands.

    • Login to reply the answers
  • rhino
    Lv 6
    1 decade ago

    Revelation 17 tells about it happening in the last days.

    • Login to reply the answers
  • 1 decade ago

    Thats interesting. Many people where I live will shoot many bullits into the sky at midnight.

    • Login to reply the answers
  • 1 decade ago

    Go get a heavy cooking pot and put in on your head. Right now.

    • Login to reply the answers
  • 1 decade ago

    err, I assume you mean Gravity (9.81 m/s^2), and yes it makes things fall if nothing is holding it up.

    • Login to reply the answers
  • rezany
    Lv 5
    1 decade ago

    maybe you outta get out of there

    • Login to reply the answers
Still have questions? Get your answers by asking now.