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Falling objects problem

  1. Sep 28, 2011 #1
    1. The problem statement, all variables and given/known data

    The problem is: A bullet shot vertically upward leaves the gun at a velocity of 655 m/s. How far above the muzzle will the bullet be 1.0 s after it is fired?

    2. Relevant equations

    3. The attempt at a solution

    I know that i have the time (1 s) and the velocity (655 m/s). I just don't know how to find the other parts and then which equation to use to find how far above the muzzle the bullet will be.
  2. jcsd
  3. Sep 28, 2011 #2


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    Staff: Mentor

    Clearly the bullet has an initial velocity and will be subject to gravitational acceleration. What kinematic formulas do you know that involve velocity and acceleration?
  4. Sep 28, 2011 #3
    v = x/t
    avg.v = v + initial v/2
    v = initial v + at
    x - initial x = initial vt + 1/2at^2
    v^2 = initial v^2 + 2a(x-initial x)
  5. Sep 28, 2011 #4
    Nevermind, gneill's suggestion is better.

    You know initial velocity, time, and acceleration (gravity, as gneill pointed out). You can solve for final velocity, which will allow you to then solve for distance.

    Does that make sense?
    Last edited: Sep 28, 2011
  6. Sep 28, 2011 #5


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    Staff: Mentor

    Your fourth equation looks promising...
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